ok this works on ubuntu now

common/.tmux.conf

@@ -1,3 +1,5 @@
+set-option -g default-shell /bin/zsh
+
 # List of plugins
 set -g @plugin 'tmux-plugins/tpm'
 set -g @plugin 'tmux-plugins/tmux-sensible'

common/.zshrc

@@ -128,3 +128,4 @@ eval $(thefuck --alias)
 export VISUAL=nvim;
 export EDITOR=nvim;
 
+[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion