Ask Ubuntu General Room

terdon

10:00

@Takkat I don't think the Ubuntu version is relevant. There's no such package in the repos.

Ah. Unless it's just libvtk.

@trilolil does it work if you run sudo apt install libvtk and then try again?

trilolil

:38998172

yalishanda@yalishanda-ThinkPad-X200:~/PCL/visualRangeExample/build$ sudo apt install libvtk
[sudo] password for yalishanda:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libvtk is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  libvtk5.10:i386 libvtk5.10

E: Package 'libvtk' has no installation candidate

Ubuntu Questions on U&L

0

Q: AWS EC2 instance says apache2 isn't running but the server is still up and httpd is listening on port 80?

So I'm trying to use certbot to get a LetsEncrypt certificate for my wordpress site on EC2 (using the AWS marketplace image by Bitnami, Ubuntu 14.04), but when running certbot --apache I get the following - Error while running apache2ctl graceful. httpd not running, trying to start Action 'grac...

trilolil

@terdon sudo apt install libvtk5.10 results in:

Reading package lists... Done
Building dependency tree
Reading state information... Done
libvtk5.10 is already the newest version (5.10.1+dfsg-2.1build1).
libvtk5.10 set to manually installed.
The following packages were automatically installed and are no longer required:
  gimp-data gimp-help-common gimp-help-en libamd2.4.1 libbabl-0.1-0 libbtf1.2.1 libcamd2.4.1 libccolamd2.9.1 libcsparse3.1.4 libcxsparse3.1.4
  libgimp2.0 libklu1.3.3 libldl2.2.1 linux-headers-4.8.0-36 linux-headers-4.8.0-36-generic linux-image-4.8.0-36-generic

terdon

OK. That's what the bug fixes, I see.

Make sure to include these commands and their output in your question.

trilolil

@terdon ok done

@terdon would you mind explaining what exactly you see? That way I learn new stuff as well

@terdon how do you know that? because sudo apt-cache pkgnames "libvtk" returns an empty list?

terdon

10:12

@trilolil I searched in packages.ubuntu.com

@trilolil I see that while there's no package containing a file whose name matches vtkjproj, there is one called libvtk which is missing. And the bug was saying it was "fixed" so, presumably, they've added it back.

Takkat

@terdon The bug says it is provided by libpcl1.7 (can't test this here atm in my all Windows office)

They even took away my spare Windows box where I had installed Ubuntu in a VM. :"(

trilolil

thanks to whoever pvoted my question :)

terdon

@Takkat Well, there is a libvtk package: packages.ubuntu.com/…

But there's no "proj" in it.

trilolil

@terdon should I try sudo apt install libvtk6.3 ?

Takkat

10:28

@terdon they way I understand the bug report this exactly is the bug. It should provide the proj file but it doesn't. But apparently vtk6 doesn't provide it in 17.04 either... weird.

terdon

@Takkat Yeah

MBehtemam

hi , i have some problem on installing mongodb , i ask my question here , i follow the instruction but i get error

Jacob Vlijm

11:13

@trilolil interesting you say that. I have two machines, working on the same directory. Search from Windows 10 was broken from the moment I bought it the machine. Quite some solutions suggested on the web, none of them work longer than 15 seconds. I have to sit behind my Ubuntu machine or use my own script I made to find stuff. Imagine... SEARCH!

But indeed, use whatever you like.

trilolil

12:18

@terdon 11 views so far, I m affraid my question isn't that popular :/

@Takkat ^

Takkat

not many people may know a solution or only few came across that at all.

terdon

@trilolil 11 views in 2 hours? What were you expecting? And that's certainly better than the 2 people who saw your question here :)

trilolil

hahah :)

let's wait...

trilolil

14:05

@Takkat will I lose all my data on my laptop if I upgrade to ubuntu 17.04 as decribed here: omgubuntu.co.uk/2017/04/how-to-upgrade-to-ubuntu-17-04

?

@terdon ^

That way I "solve" my problem

Takkat

@trilolil Install 17.04 in a virtual machine if it was only for testing or compiling. But no, you will only lose data in your HOME if you chose an option that said so...

Ask Ubuntu Meta

14:30

0

Q: Should we not downvote if a question already has a bad score?

Alright, so I know this is going to be controversial, but here goes: I was perusing the home page and saw this question: Now, obviously that is a bad question and certainly does deserve a negative score. I was about to downvote, but I'm torn. On one hand, I want to downvote because it's a...

discussion

TheWanderer

14:57

ooooh

Google made a palette creator material.io/color/#!/?view.left=0&view.right=0

Nathan Osman

15:38

Ohai.

Does anyone know if it is possible to launch a process under the Local System account through a command prompt on Windows?

Tweeted by nathanosman_dev on July 25, 2017 at 3:40 PM

Anyone?

TheWanderer

no

Nathan Osman

Kthxbai.

j/k

TheWanderer

hue

Nathan Osman

@AndroidDev just letting you know I haven't forgotten about your pull request.

I have been busy trying to fix some rather serious issues with the upcoming version of the desktop client.

TheWanderer

do you know of anything that would let me have a fancy link to a specified GitHub repo?

like how Google has the Get it on Google Play thing

terdon

15:59

@TheWanderer What would be fancy about it?

TheWanderer

ie more than a text link

img.shields.io/badge/GitHub--green.svg maybe

Nathan Osman

@TheWanderer Font Awesome has the GitHub logo.

TheWanderer

they're paid

oh

Nathan Osman

No, not Font Awesome's base set.

TheWanderer

how do I resize?

nvm

trilolil

16:11

@Takkat to be sure, does that include everthing on my desktop etc?

user2476549

hey guys, scroll lock key isn't being recognized in keyboard shortcuts?. i can remap every other key but pressing scroll lock doesn't get a reaction

Ubuntu Questions on U&L

16:34

0

Q: Ubuntu terminal takes time to load?

I'm using Ubuntu 16.04 . Earlier terminal was opened and load pretty quickly. But now window opened but it takes about 15 seconds to load. What is the reason for that and how to reduce the loading time?.

ubuntu terminal performance

user2476549

"gnome-control-center keyboard" shortcut changing app doesn't seem to recognize scroll-lock by default. i had to manually set my shortcut to Scroll_Lock in deconf org.gnome.settings-daemon.plugins.media-keys .. bug?

terdon

@user2476549 Please post questions on the main site. That way, other people can also benefit and more people will read it, so you have more chances of getting help.

user2476549

16:49

@terdon is it considered bad etiquette to ask and answer your own question?

terdon

@user2476549 Not at all. It is considered good etiquette, since you are nice enough to share your knowledge.

107

Q: What is this "answer your own question" jazz?

I showed up here to write a perfectly normal rant about misaligned pixels, and there's a big fat checkbox cluttering up the "Ask" page: WHAT THE EEEEK IS THIS NEW ABOMINATION?

support asking-questions self-answer instant-self-answer

user2476549

oh cool, I haven't seen that checkbox. Thanks

Seth

We'll stop updating & distributing Flash Player by the end of 2020. More about our plans & a look at what’s next:… https://twitter.com/i/web/status/889878192994918401

Tweeted by Adobe on July 25, 2017 at 4:01 PM

3

FINALLY. YESSSSSS

Nathan Osman

\o/ \o/ \o/ \o/ \o/ \o/ \o/ \o/ \o/ \o/

REJOICE - FOR THE FLASH PLAYER FINALLY DIES!

@ThomasWard will be beside himself with unexpected joy at the news.

terdon

17:09

@Seth Oh wow. I can hardly believe it. YEEEEEeeeessssssssssssssss!

No, wait. 2020!?

Sigh

Seth

Unfortunately I'm sure the decision to add DRM to the HTML5 spec had something to do with it.

@terdon just 3 years out

TheWanderer

didn't they already do that before?

terdon

@Seth As did Job's decision to not support flash on the iPhone. That more than anything else, probably. Here's something even the most die hard Apple haters here should be able to appreciate.

Rinzwind

@Seth 2020.... why not in 2017 :(

Nathan Osman

DisplayLink works on macOS.

Now I have three monitors. \o/

Terrance

17:22

Woot Woot! =)

Rinzwind

@NathanOsman why not be bleeding edge and go for 4 :=)

Nathan Osman

I only have three.

Actually, that's not true!

I have another 7" with HDMI input.

The problem is... I don't think I have any more HDMI outputs on my video card.

Rinzwind

solder one :=)

SmokeDetector

[ SmokeDetector | MS ] Few unique characters in body: Ubuntu 16.04 How to install rsync server for other systems to access via ssh by SDsolar on askubuntu.com

Terrance

@NathanOsman What Mac is it that your are attaching those monitors to?

Rinzwind

17:35

@Terrance one he paid 40% too much for >:=D

Terrance

@Rinzwind LOL! =D

Nathan Osman

@Terrance Late 2015 Mac Mini IIRC.

Terrance

@NathanOsman Ah, OK. I was thinking if it was a MacBook like the one I have sitting on my desk here at work that is powered off at the moment, ;) ;), it has 2 lightning ports on the left and one HDMI on the right. With the screen open that makes 4. =)

Nathan Osman

I've got Synergy working with three PCs now.

Linux, Windows, and macOS.

One of each.

\o/

Terrance

Welcome to the Synergy Club! =)

Rinzwind

17:40

synergy <3

Terrance

Synergy is awesome!

Rinzwind

I funded it by buying 5 licenses I only ever used 1 at most :=D

Terrance

I did find that if I run Synergy in the server mode on my Ubuntu, then client on my Windows and Mac I have less problems. =)

Oh, and I don't use the "Synchronize Screensavers" between them because if I log in remotely once my VPN kicks in, so does my screensaver if I forget to turn off Synergy on my local system.

Nathan Osman

It's not the largest display...

But it works :P

Terrance

You could play a small game on it. ;)

Nathan Osman

17:52

The v4 beta driver does Metal apparently.

So I guess gaming is a possibility.

That requires High Sierra though.

Which I do not have installed.

Chrome has rendering glitches but Safari works alright.

Terrance

That's cool. :)

Is Spacedesk any good?

Nathan Osman

Never tried it.

Does it require root?

Terrance

It doesn't say

Nathan Osman

Might be worth a shot if not.

I don't have root on my phone due to Android Pay.

Terrance

Same, but I use the Samsung pay with the MST

Nathan Osman

18:00

How do you like Samsung Pay?

I hear it's a bit easier to choose the card to use during payment.

Terrance

I earn points with it that I can use for drawings and stuff. It is easier for picking the card. Plus, Magnetic Secure Transaction almost works everywhere. Sometimes at WallyWorld (Walmart) it is hit and miss, but for the most part it is good. It also support NFC (Tap and Pay) without using Android Pay.

Nathan Osman

I tried to use mine at Walmart the other day but the reader didn't support tapping.

Terrance

The MST you hold right above the Magstripe reader

Oops, Magnetic Secure Transmission, not Transaction, my bad. It is fun to use at the older terminals when people claim they don't support Apple Pay, etc. =)

samsung.com/us/support/answer/ANS00043865

Takkat

18:36

@trilolil you will have to restore all users, and re-install all applications. Anything outside of /home/ is at risk but data in /home/ should be safe (that also includes settings, and your desktop, both should be untouched). Make a backup before you proceed to be on the safe side.

Ask Ubuntu Meta

18:47

0

Q: My answer was deleted after I fixed it, is this acceptable?

I posted an answer which wasn't well received and it got deleted. You can see the question here. The help center states some reasons for an answer deletion: commentary on the question or other answers... not my case asking another, different question... not my case “thanks!” or “me too!” resp...

discussion deleted-answers

Nathan Osman

Yikes.

linkedin.com/pulse/…

Kaz Wolfe

android pay > samsung pay

Nathan Osman

Google's style guidelines are... O_o

Kaz Wolfe

but samsung pay is convenient

yo @NathanOsman i need some help

Nathan Osman

With Android Pay, it always uses the default card. Always.

@KazWolfe Yes?

Kaz Wolfe

18:55

so i have a raspberry pi

i need to do something very specific...

Nathan Osman

Which model Pi?

Kaz Wolfe

connect to a serial port, read all the data from it, and dump it to a file as soon as it comes in

b+

Nathan Osman

Ah.

Actually, my Pi does something somewhat similar with sensor data from an Arduino.

Kaz Wolfe

so i have everything i need, and i'm thinking turn this into a service.

Nathan Osman

I wrote a Qt (C++) app that reads from the serial port.

Kaz Wolfe

18:56

problem is, the state of the serial device is more or less unknown. it may or may not be there

Nathan Osman

Due to being physically disconnected?

Kaz Wolfe

right

Nathan Osman

Ah.

Kaz Wolfe

or powered off or whatever

Nathan Osman

Right.

Kaz Wolfe

18:57

so i need some sort of solution for the serial thingy that works even if the device is unplugged

(so, if possible, without locking the serial device)

the pi will be rx-only

Nathan Osman

Let me see what my app does...

Kaz Wolfe

actually i just need something that immediately dumps bytes to a file

Nathan Osman

Here's the app: github.com/nathan-osman/thsat

Here's the actual code that interacts with the port: github.com/nathan-osman/thsat/blob/master/src/arduino.cpp

Kaz Wolfe

that should make life easier

Nathan Osman

So it attempts to open the device and if it fails (either during opening or afterwards) it will retry the connection in 30 seconds.

The readyRead() signal could be adapted to just readAll() and then dump the data into a file.

Kaz Wolfe

19:01

hmm... shell script to test existence of device? if the device does not exist, try again in 5 seconds

Nathan Osman

I imagine that if the device disappears, an error is thrown when trying to read from it.

Kaz Wolfe

if it is, open in screen or something

meh i'll think of something

trilolil

I am wondering, does anybody know why make or make install is so much slower than doing apt install? AFAIK apt install probably also does "make" behind the scenes

Seth

No it doesn't. apt uses pre-compiled binaries. make is doing the compilation from scratch.

trilolil

19:16

hmm thx

@Seth

But why doesn't everybody share their software with precompiled bins? As that's much quicker

that way users don't have to lose time compiling stuff themselves from scratch

Ubuntu Questions on U&L

19:32

1

Q: Why is port forwarding via libvirt hook hijacking external NAT traffic?

I have an Ubuntu box acting as both a NAT gateway as well as hosting KVM virtual machines. I followed a guide to use the libvirt qemu hook to forward ports to one of the KVM VMs, but this seems to also be hijacking outgoing connections to those ports from any of the NAT'd boxes. eno0 = 192.168.7...

ubuntu kvm port-forwarding ufw libvirt

Haitham A. El-Ghareeb

@trilolil because make compiles the source code, may be compile the dependencies, link the compiled objects to generate the binaries, however apt install directly fetches the binaries. Compilation is a complicated process.

Nathan Osman

19:46

So it sounds like Microsoft is keeping Paint but they're moving it to the Windows Store.

TheWanderer

20:01

@NathanOsman no, that's Fresh Paint

Nathan Osman

Whatever it is, there goes one of the first programs to run in Wine.

TheWanderer

we still have Notepad

Nathan Osman

For now...

TheWanderer

I wouldn't mind if they killed that off tbh

give us Sublime preinstalled pls

Nathan Osman

It's basically useless without support for \n newlines.

TheWanderer

20:02

srsly

everything goes to one line!

Nathan Osman

Even just fixing that would make it infinitely more useful.

Remember Windows 98/Me where Notepad couldn't even open files larger than 50 KB?

TheWanderer

20:17

pretty sure it still can't

Nathan Osman

It can.

Ask Ubuntu Meta

1

Q: Does it make sense to continue to post links to apps.ubuntu.com in answers?

Specifically I'm asking about the concept discussed in the top rated answers in the meta post How to post links that integrate with the Software Center? Once upon a time, when apps.ubuntu.com was up to date this was kind of cool. Currently however, none of the currently supported versions of Ubu...

discussion

Nathan Osman

I actually might like using Windows if computers came preinstalled with Windows Server :P

It's far far more stable than the consumer versions and more lightweight.

I am running four Jenkins slaves, an IDE, explorer, etc. on a server with 1.25 GB of RAM.

You can't even do that with Win10 64-bit, it doesn't meet the system requirements.

@chili555 hey, long time no see!

chili555

20:36

Hello, @NathanOsman and all!

Nathan Osman

How goes life?

Byte Commander

o/

chili555

It goes well for now. And you?

Nathan Osman

Good.

Cross-platform programming is hard :D

But I am learning a lot.

Byte Commander

20:53

@Rinzwind I'm finally getting to watch Blink today :) \o/

Rinzwind

yay.

prepare to get scared

Byte Commander

my wifi hates me :(

TheWanderer

@ByteCommander but you shouldn't blink

Android Dev

21:26

@NathanOsman no worries :) I'd like to help with the back end too, but I'm not familiar C++ so I don't think I'd be of much help

Nathan Osman

Yes, but I'm writing it in Go, I think.

Android Dev

@EuanFoster How can we help you troubleshoot if you haven't even told us what the issue is? — Android Dev 27 secs ago

sigh

TheWanderer

does JS let you remove classes from an element?

Nathan Osman

21:50

Are people still buying iPod Classics?

@TheWanderer JS doesn't have classes.

At least, not in the sense that other languages do.

TheWanderer

@NathanOsman you have to know I meant element classes

element.classList.remove() works well

Nathan Osman

Oh.

CSS classes.

TheWanderer

jeez

Nathan Osman

Lol, my brain isn't working today.

I have so many other things on my mind.

TheWanderer

lesigh

are you serg

Nathan Osman

21:57

Is jQuery an option?

TheWanderer

yeah

but I got it working

Nathan Osman

Then it is simple:

TheWanderer

and I don't care that IE won't work

Nathan Osman

$('#elementID').removeClass('myclass');

IE should work fine.

TheWanderer

not with my method

>:)

Nathan Osman

21:58

Uh... oh...

This doesn't sound good.

TheWanderer

well 10 and up

but I don't want IE users using my app anyway :p

wat

Nathan Osman

There's always Edge.

TheWanderer

that's as bad isn't it?

Nathan Osman

Which is far more standards compliant anyway.

No, Edge is much better at following standards.

It's right up there with Firefox and Chrome now.

TheWanderer

meh it crashes too much for me

Nathan Osman

21:59

Well, you can't have everything :D

TheWanderer

pls

Nathan Osman

For the record, Chrome can crash too.

Terrance

Sad face Edge doesn't work with the Proxies I have at work to access our tools. Chrome or Waterfox or Opera all connect quite well. :(

Nathan Osman

That's a shame.

Although I don't really use Edge much either.

It isn't available for Windows 7 and that's mostly what I find myself using.

Therefore Chrome.

Terrance

We have actually been told not to use IE or Edge as the proxies just don't work with them for some reason.

Nathan Osman

22:02

Hmmm.

Terrance

I personally like Waterfox though. :D

trilolil

22:46

hello

I would like to know when compiling something from source and installing it using: cmake, make, sudo make install. Is it enough to do "sudo make uninstall" to undo all the previous 3 commands?

Luke

depends on the Makefile, there could be a "clean"(-like) target, so e.g. "make clean" or "make tidy" could be needed to clean up the directory from compiled files

anyone using Budgie?

0

Q: Switching windows of same app on Budgie

I have recently switched to using Budgie as my primary desktop environment, and one thing that has been annoying me is apparent inability to switch between windows of the same program (when there are multiple instances running) from Plank. Alt+ ` (grave) do work usually, though it's kind of annoy...