ubuntu 18.04 沒有 gksu

ubuntu 18.04找不到gksu套件，解決方法
增加套件源

cat <<EOF | sudo tee /etc/apt/sources.list.d/artful.list
deb http://archive.ubuntu.com/ubuntu/ artful main universe
deb-src http://archive.ubuntu.com/ubuntu/ artful main universe
EOF 

更新套件

sudo apt update

安裝指令 

sudo apt install gksu