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8:06 AM

Q: Linux won't boot with Nvidia GTX only

I have a headless computer (no screen / no keyboard) used as a machine-learning training server (using a GPU). I connect it via SSH from my laptop. When: I start the computer with Nvidia GTX 950 as the only graphic card connected on the motherboard, it seems it doesn't boot, and I cannot SSH ...

Ubuntu Questions on U&L

8:37 AM

Q: Xorg log full of RandR output

I am running Ubuntu 14.04.1 on some specialised hardware that directs manipulates the HDMI output before displaying it to the screen. I am noticing that from time to time the Xorg log goes crazy with constant output as if xrandr is being called and logged again and again and again. Afters a few ...

ubuntu xorg graphics

1 hour later…

Ubuntu Questions on U&L

9:56 AM

Q: Problems installing Ubuntu / Kubuntu 18.04 on new build computer

I build a new computer with Gigabyte B360n wifi motherboard (Bios F4), a I7 8700 and a Sapphire Radeon RX 590. Linux Mint KDE 18 Serena booted perfectly, and installed without producing errors in uefi mode with activated csm in bios. (K)Ubuntu did not, even with all combinations of secure boot / ...

ubuntu kubuntu radeon

3 hours later…

Ubuntu Questions on U&L

1:20 PM

-1

Q: Even with WaylandEnable=false gdm3 and lightdm only load sometimes

I am happy to use either gdm3 or lightdm, but neither are stable on my Ubuntu 16.04 system, they will work for either one or several boots after I take corrective action, but inevitably this results in the greeter not loading - the last few times (at least) I noticed this was immediately after I ...

ubuntu nvidia lightdm gdm

Ubuntu Questions on U&L

1:51 PM

Q: Error while trying to compress pdf using ghostscript recursively via loop

I intend to compress a few thousand PDF files in a folder recursively. I tried with following loop: #!/bin/bash find "/home/user/original" -type f -name *.pdf | while read -r file do gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress -dNOPAUSE -dBATCH -dQUIET -sOutputFile="/...

bash shell ubuntu find ghostscript

Ask Ubuntu Meta

2:26 PM

Q: Is reverse voting or merging a solution in this case?

I just read a question, Is there a command to factory reset Ubuntu? (asked on Dec '16) which was marked as duplicate of Resetting Ubuntu to factory settings (asked on Feb '15) back in Aug '18. But after seeing votes on the answer (including anonymous votes) and views on the earlier question, I b...

discussion duplicates merge

PerlDuck

2:40 PM

I tend to start giggling when I read questions like “I cannot change my brightness” and “I have a brightness problem”. Maybe I am too childish.

TheWanderer

"it doesn't work"

Thomas Ward

3:01 PM

@TheWanderer Those ones just irk me lol

and I usually close them and say "DETAILS NOOB!"

... but in a much more civil way :p

TheWanderer

come to SO

Thomas Ward

(I'm not 100% awake yet right now lol)

TheWanderer

basically 85% of questions

Thomas Ward

@TheWanderer no thanks, i'm good :P

TheWanderer

"I tried some code that I don't mention here but it didn't work. What do I do"

Rinzwind

3:05 PM

any "csv" experts? is there an easy way to split a file that has NO enters or linefeeds but does have records that start with the length of the record? Example:
000000010xxxxxxxxxx000000020xxxxxxxxxxxxxxxxxxxx and so on >:)

(in python :+)

PerlDuck

That is how Pascal stores strings. Like struct string { int length; char[] data };

Rinzwind

hmm that's a good one :P

Ask Ubuntu Meta

3:28 PM

Q: Should questions closed here and then posted in another SE site be flagged for deletion?

For example, Errors where encountered while processing and mint is weird - Linux mint [on hold] has been put on hold as off-topic. The poster then posted here. Should such questions be flagged for deletion, or left as is?

discussion support

1 hour later…

PerlDuck

4:52 PM

@Rinzwind What about Perl and its fabulous unpack function?

    #!/usr/bin/env perl

    use strict;
    use warnings;
    use Data::Dumper;

    my $line = '000000011Hello World000000020xxxxxxxxxxxxxxxxxxxx000000006abcdef';
    my @record = unpack( '(A9/A*)*', $line );
    print Data::Dumper->Dump( [\@record], ['*record'] );

Output:

    @record = (
                'Hello World',
                'xxxxxxxxxxxxxxxxxxxx',
                'abcdef'
              );

Thomas Ward

5:06 PM

burn the perl. BURN THE PERL!

THE PERL IS EVIL

PerlDuck

LOL. But you must admit that the simplicity of that unpack line is unbeatable.

Zanna

@PerlDuck hahaha

@PerlDuck would you mind explaining the (A9/A*)* expression? I don't know Perl, so, feel free to tell me to go and learn things (or adjust my brightness) instead of asking fool questions

Rinzwind

5:24 PM

@PerlDuck eh if perl has that does python not? :P

@Zanna SAME Q! >:)

Zanna

^_^

Rinzwind

and is it the same as this docs.python.org/2/library/struct.html ?

@Zanna but(!) I assumed "alphanumeric 9" as the length at the front is 9 digits for the length of the record

PerlDuck

@Zanna You may have a look into the pack tutorial.

- A9 is an ascii string of length 9 (that is the '000000011' in the input).
- A* means an ascii string of arbitrary length (until end-of-input).
- When connected via "/" it means: pick the length from A9 and return a string of that many characters.
- The ()* around it just means: repeat until input is fully gobbled up.

Rinzwind

HA!

Zanna

nice :D

PerlDuck

5:28 PM

@Rinzwind Almost. Python even has a "p" which means "pascal string" but the number is stored as binary and limited to 255.

Rinzwind

aha

well ...I have not got an example here but it probably IS binairy

now for a far more important problem

what to eat this evening

PerlDuck

In Perl you would then write (N/A*)* (the N being a 4 byte integer in network order)

Thomas Ward

@Rinzwind no that's not important enough

what's actually important is

WHERE'S THE RUM GONE?

shot

Rinzwind

thuisbezorgd.nl/eten-bestellen-roermond-6044

someone pick a company for me

Thomas Ward

which has the lowest rating lol

Rinzwind

5:33 PM

FO's but that's cuz it is new ;)

only has 8 reviews :

Thomas Ward

so which has the lowest rating with a LARGE number of reviews lol :P

is evil

now seriously where's the rum :P

Rinzwind

lol one of them has a discount on a family dinner. 36.50 now for 35 euro :P

Taiwanese it is! wok shrimp

40 minutes :P

2 hours later…

Ubuntu Questions on U&L

8:07 PM

Q: UBUNTU on Windows 10 public key/alias/server

I just installed the Ubuntu App on my Windows 10 desktop. I'm unfamiliar with Unix, but enrolled in a Python course and doing some hunting around the web. For the course, I use AnyConnect VPN. Instead of logging into the course server using powershell, I installed Ubuntu. I then generated a publ...

ubuntu key-authentication windows-subsystem-for-linux

3 hours later…

Ubuntu Questions on U&L

11:16 PM

Q: mbuffer how does the -T Param work

I'm currently trying to make a tar backup to a tape with mbuffer acting as a buffer between e.g: tar --acls -c /var/test | mbuffer -m 8G -P 100% -R 100M | dd of=/dev/nst0 bs=256k But the buffer is still empty about 10-20 times. So I wanted to use a file based buffer with the following command:...