I installed Ubuntu 16.04 just a couple of weeks back. Recently I started seeing a red error button on my notification shade on the top right saying
An error occurred, please run package manager from the right click menu or apt-get in a terminal to see what is wrong.
The error message was:
Error opening the cache (E: type sudo is not known on line 55 source list/etc.apt/sources.list,E: The list of sources could not be read). This usually means your installed packages have unmet dependencies
How can I solve this?
I tried the suggested commands "ls -l /usr/bin/sudo" ,"sudo apt-get install -f" and "sudo dpkg --confiure -a" as suggested .So here is my terminal output to the commands in form of this terminal screenshot. Please check the attached screenshot and help me further. terminal 1