Ubuntu Linux related tutorial/FAQ

Ubuntu 20.04 LTS change hostname permanently

last updated January 22, 2020 in Linux, Ubuntu Linux

I am a brand-new Ubuntu Linux 20.04 LTS VM user. By default, my server name to ‘localhost’ during cloud installation, but now I would like to change the computer name to ‘ubuntu-2004-nixcraft’. Can you tell me how do I remove the localhost and set it to ubuntu-2004-nixcraft on Ubuntu 20.04 Linux? How do I change the Ubuntu computer name from ‘localhost’ to ‘ubuntu-2004-nixcraft’? Can you tell me more about Ubuntu Linux change hostname command?

Upgrade Ubuntu 18.04 to 20.04 LTS using command line

last updated January 22, 2020 in Linux, Ubuntu Linux

I need to upgrade the Ubuntu Linux version 18.04 LTS server to a 20.04 LTS server using the command line option. How do I upgrade Ubuntu 18.04 to 20.04?

Linux find Windows 10 OEM product key command

last updated January 17, 2020 in CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse, Ubuntu Linux, Windows

I removed and installed Ubuntu Linux 16.04 LTS on my development Lenovo laptop. However, I need to use my Windows 10 pro in KVM VM for running the accounting app. How do I find and print my embedded Windows 10 pro key from a Linux command line option? How can I retrieve Microsoft Windows 8 and 10 OEM product key from BIOS?

How do I count how many processes are running in Linux?

last updated December 21, 2019 in BASH Shell, CentOS, Commands, FreeBSD, Linux, RedHat and Friends, Suse, Ubuntu Linux, UNIX

How do I see how many processes are running in Linux? How can count all running processes in Linux?

bash: file: command not found. How to install file

last updated November 13, 2019 in Commands, Debian / Ubuntu, Linux, Package Management, Ubuntu Linux

I am running file /usr/sbin/arp command on a Debian VM minimal but getting an error that read as:
bash: file: command not found
How do I fix this error on a Debian or Ubuntu Linux system? How can I install file command on Linux cloud?

Ubuntu 18.04 remove all unused old kernels

last updated October 9, 2019 in Linux, Package Management, Ubuntu Linux

How do I remove all unused old kernels in Ubuntu Linux 18.04 LTS using the command line?

Change netplan renderer from networkd to NetworkManager

last updated October 7, 2019 in Linux, Ubuntu Linux

I prefer to use NetworkManager on my Ubuntu desktop, but currently, it is using networkd. As a result, I cannot set up or configure NetworkManager using GUI tools. Is there anyway to change netplan renderer from networkd to NetworkManager running on Ubuntu Linux? How can I change netplan renderer in Ubuntu Linux?

nixCraft