I used to be able to undo actions all the way until a file was opened. Recently, I've been unable to do that, and I'm unable to undo actions beyond a certain point, which seems random, but might be related to the undo buffer size.
I was just wondering if anyone might have come across this problem, and if there might be a solution.
I downloaded Emacs source files, and installed it using make. After installing Emacs successfully, I manually removed the downloaded source files to save disk space. Now I want to remove Emacs and I tried to use sudo apt-get purge emacs. But it says Emacs has not been installed and will not be removed. But I can run Emacs by typing emacs in the terminal.