Accidentally deleted 'sudo' [duplicate]

Solution 1:

The reason I write this instruction here is that I didn't find a step-by-step solution when I ran into the problem myself. I'm a Linux newbie myself, so feel free to edit this :)

These steps solved the problem for me:

Boot into recovery mode (press Esc or left Shift after BIOS splash)

Select Drop to root shell prompt option

Mount the file system in writable mode:

mount -o rw,remount /

Add the internet connection (I'm not sure if this works with Wi-Fi):

dhclient eth0

Now you have to purge the existing sudo package. It's protected against removal, so you have to set this environment variable:

export SUDO_FORCE_REMOVE=yes

Purge the sudo:

apt-get purge sudo

That command also purged the ubuntu-minimal package, so if we run

apt-get install ubuntu-minimal

this will restore both packages

Reboot the system:

reboot