In Synaptic Package Manager, I accidently selected "Mark for Complete Removal" instead of "Mark for Removal".
Now I want to reinstall the package; however in Synaptic, that package is no longer even listed so there is no way for me to select it. I can see from the Synaptic history window that I had deleted it, but other than that I do not see an option for getting it back.
From internet searching, I tried:
sudo apt-get install ubuntu-desktop
but this did not help.
How do I recover/restore the list of all Packages in Synaptic that I have "completely removed"?