Fix: Ubuntu (Linux) - bash: sudo: command not found error

c2c@d12f83dc01b5:/# sudo apt-get install nano
bash: sudo: command not found

You might get bash sudo command not found error if you do not have sudo package installed. I faced the same issue when I installed Ubuntu image on Docker container.

root@d12f83dc01b5:~# apt install sudo

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed: sudo
0 upgraded, 1 newly installed, 0 to remove and 15 not upgraded.
Need to get 473 kB of archives.
After this operation, 2175 kB of additional disk space will be used.
Get:1 http://ports.ubuntu.com/ubuntu-ports focal-updates/main arm64 sudo arm64 1.8.31-1ubuntu1.2 [473 kB]
Fetched 473 kB in 2s (307 kB/s)
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package sudo.
(Reading database ... 4120 files and directories currently installed.)
Preparing to unpack .../sudo_1.8.31-1ubuntu1.2_arm64.deb ...
Unpacking sudo (1.8.31-1ubuntu1.2) ...
Setting up sudo (1.8.31-1ubuntu1.2) ...

Make sure you are logged into as root user, else switch to root user using su root