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.



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