I am logged into one machine as user "john" and now if I try to switch to another user "dummy", I am getting below error. Long time back I only created this "dummy" user but forgot how I did that: john@machineA:~$ sudo su - dummy Your account has expired; please contact your system administrator...

On Ubuntu, when running sudo apt update; sudo apt upgrade, why sometimes it asks me to restart my OS and sometimes not? What do the packages that have that restart requirement have in common? Is it not possible to update such a package without restart OS requirement? Thanks. I often keep my ...

I'm in the process of upgrading from Ubuntu Server 16.04 to 18.04 and at the same time upgrading from PHP 5.6 to PHP 7.3. In /etc/memcached.conf I added: -s /tmp/memcached.sock -a 666 When I restart the service, I see: srw-rw-rw- 1 memcache memcache 0 Nov 13 03:44 /tmp/systemd-private-7fc3b7...

I'm getting an issue using the default player playing videos, vlc works ok. I've tried installing restricted packages and it went on successfully. sudo apt-get install ubuntu-restricted-extras [sudo] password for sam: Reading package lists... Done Building dependency tree Reading state ...

Is it OK to use the swap partition and swap file at the same time? Could anything possibly go wrong? Linux Mint 18.3 (based on Ubuntu 16.04)

I don't have internet access on my new Xenial VM, but I do have SFTP to a server which does. The issue is I need to install some packages. Getting them is fine, I just download them to my internet-connected server and transfer to the VM. My issue I've only seen tarballs installed with "Make". I h...

I am running a Jupyter Notebook with some computations that take more than one day, and I want to run them over night. I usually lock the screen on my laptop and leave it running. Everything runs for a few hours, then the notebook crashes and I think this is due to the screen lock. Does it turn t...

I have problems installing the program 'pxz' using a script executed in crontab. The script: if [ "$VERSION" = "Ubuntu 14.04.3 LTS" ]; then apt-get install pxz --assume-yes pxz -e -T4 $DIRA/$NOM_ARCH else xz -e $DIRA/$NOM_ARCH fi

I made a Linux Ubuntu 16.04 VDI image on VirtualBox on an Intel i7 machine (4 CPUs), with a set of tools inside. Then I copied that VDI to an old machine (Core 2 duo - 2 CPUs), I created the VM using the VDI file copy. The image boots, but runs very slowly with 1 CPU (which is obvious). The prob...

i'm unable to boot from an external hard disk with ubuntu installed via usb installation media. i fully installed ubuntu 17 OS in my external HD, but the issue is that i cannot boot at all from it. it says nothing and it's not even showing up in the boot list.

i can`t make a bash script who check if a input numbers in command line is an power of 2 input # ./powerscript.sh 4 8 12 -2 desired output : the desire output should be on seprated lines 4 8 because only 4 is 2^2 and 8 is 2^3 content of powerscript.sh #!/bin/bash if (( number % 2 == 0 )...

to one of the themes I receive, I have a verifier giving points so the requirement is when you run the (input)command # ./powerscript.sh asdf 8 -2 uso 16 31 SJDHA the output should be: 8 16 and the contect of powerscript.sh: for number do w=0 n=$number while (( n > 0 )); do ...

On our home LAN, after rebooting the router, I cannot ssh from laptop A to laptop B except via the router. However, after doing a ping from laptop B to laptop A, I can connect normally from A to B. I can reproduce this issue by rebooting the router. Both laptops are connected to the router via Wi...