I have been running Ubuntu 16.04 on my older Dell (8yrs) now. Recently things have been getting buggy. Until 30min ago I could not
apt install anything, I just resolved this issue by deleting
/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_xenial-security_main_binary-amd64_Packages and updating apt package manager.
First, and most important, when running
sudo apt update
I get the following error
`Err:39 http://ppa.launchpad.net/webupd8team/gnome3/ubuntu xenial Release 404 not found`
Other misc. craziness I am dealing with.
Symptom: Occasionally (especially after running virtualbox for a while) my icons will disappear from the side bar, the text will disappear from the window bars, and the text will disappear from the gnome terminal window.