Create a button to shutdown the PC.
- Create a .desktop file:
vim ~/.local/share/applications/shutdown-for-dock.desktop
- With this content:
[Desktop Entry]
Name=Shutdown for Dock
Exec=gnome-session-quit --power-off
Comment=Shutdown button for Ubuntu dock
Terminal=false
Type=Application
Icon=system-shutdown
Then search for "Shutdown for Dock" it on "activities" or "applications list" and set as favourite. Done!