Guake hangs when exit on Ubuntu 18

Guake is a dropdown terminal made for the GNOME desktop environment. Guake's style of window is based on an FPS game, and one of its goals is to be easy to reach. Recently, my new Ubuntu 18.04 LTS is meeting a bug. When I was trying to exit a shell, the Guake would hang over there, which makes this application even unable to use.


SSH port forwarding

SSH port forwarding is a mechanism in SSH for tunneling application ports from the client machine to the server machine, or vice versa.

Suppose we wish to visit a port in remote but behind the firewall, we can use SSH port forwarding to bind that port into local.