What shell are you using?
echo $0
Install ZSH
sudo apt-get install zsh
I’ve run into trouble if I don’t change shells before installing Oh My ZSH
which zsh
Should show something resembling /usr/bin/zsh
chsh
Enter the new value, or press ENTER for the default Login Shell [/usr/bin/zsh]:
Install Oh My ZSH
curl -L http://install.ohmyz.sh | sh
Reload all the things
source ~/.zshrc