1.查看是否安装 Ubuntu-dock(新版本的Ubuntu自带Ubuntu-dock version>= 18.04)
gnome-extensions list
2.安装Ubuntu-dock
sudo apt install gnome-shell-extension-ubuntu-dock
3.重启,一定要重启!!!!
4.启用Ubuntu-dock
gnome-extensions enable ubuntu-dock@ubuntu.comgnome-extensions disable ubuntu-dock@ubuntu.com