Install user-mode-linux-doc by entering the following commands in the terminal:
sudo apt update sudo apt install user-mode-linux-doc
Description:
User-mode Linux (Documentation)
Additional documentation for the user-mode-linux package, it consists of a copy of the useful web pages of http://user-mode-linux.sourceforge.net/
Homepage: http://user-mode-linux.sourceforge.net/
Version: 20060501-2
Section: universe/doc