Prereq:
apt-get install zsh
apt-get install git-coreInstall oh-my-zsh.
# via curl
curl -L https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh | sh
# via wget
wget https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O - | shand then you change your shell to zsh
chsh -s `which zsh`
and then restart
sudo shutdown -r 0
This problem is explained in depth in this issue