1. Enter the following command in the terminal:
metacity --replace
If you close the process, it will return to its original state.
To run it in the background, enter the following command:
metacity --replace &
2. Directly kill the port number and apply for a new port number.
3. Replace other window managers:
metacity is the default window manager for gnome.
compiz --replace kwin
--replace
gnome-shell --replace
