Ubuntu Linux related tutorial/FAQ

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?

How to install networked HP printer and scanner on Ubuntu Linux

last updated August 10, 2019 in Hardware, Linux, Ubuntu Linux

I have HP Officejet Pro printer and scanner. How do I install HP Officejet Pro network printers and scanners on Ubuntu Linux? How can I install HP printer on Ubuntu Linux?

How to check CPU temperature on Ubuntu Linux

last updated August 5, 2019 in Hardware, Linux, Package Management, Ubuntu Linux

How do I check CPU temperature in Ubuntu Linux using a command line and GUI tools on my Thinkpad laptop or Desktop computer?

How to install htop on Ubuntu Linux using apt

last updated November 22, 2019 in Linux, Package Management, Ubuntu Linux

I like htop output, but it is not installed by default on my Ubuntu cloud server. How do I install htop on Ubuntu Linux 18.04 LTS server?

Can I delete /var/cache/apt/archives for Ubuntu/Debian Linux?

last updated July 23, 2019 in Debian / Ubuntu, File system, Linux, Ubuntu Linux

I noticed that /var/cache/apt/archives/ taking lots of disk space on my AWS EC2 cloud server powered by Debian Linux. Can I delete /var/cache/apt/archives/ folder? Is it safe to remove all files? Do we absolutely necessary to keep all these files?

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