先安装zsh，同时移除之前可能的oh-my-zsh的安装

sudo apt-get install zsh

if [ -d ~/.oh-my-zsh ]; then
rm -r ~/.oh-my-zsh
fi

自动安装「oh my zsh」, 这个是用来配置zsh软件。(https://github.com/robbyrussell/oh-my-zsh)

wget https://github.com/robbyrussell/oh-my-zsh/raw/master/tools/install.sh -O - | sh

然后把shell切换成zsh，并重启计算机。

chsh -s `which zsh`

sudo shutdown -r 0

Ubuntu上安装zsh