<<install gnome-tweaks
sudo apt-get install gnome-tweaks
<<run gnome-tweaks
>>press : alt+F2 or alt+Fn+F2
gnome-tweaks
<<select window
set the : titlebar buttons > Placement > left or right
ubuntu 18. use gnome-tweaks
原文：https://www.cnblogs.com/JamyWong/p/9723674.html
