[ubuntu] Fix minor issues in `set_preferences.sh`
[ubuntu] Fix minor issues in `set_preferences.sh`

b-boogaard/dotfiles,christophermoura/dotfiles,zlot/dotfiles,makabde/dotfiles,zlot/dotfiles,EDiLD/dotfiles,wingy3181/dotfiles,khornberg/dotfiles,wingy3181/dotfiles,mickael83/ubuntu-dotfiles,newtonne/dotfiles,girishramnani/dotfiles,mickael83/ubuntu-dotfiles,sophatvathana/dotfiles,makabde/dotfiles,christophermoura/dotfiles,wingy3181/dotfiles,AlbertoElias/dotfiles,girishramnani/dotfiles,EDiLD/dotfiles,AlbertoElias/dotfiles,newtonne/dotfiles,pbrooks/dotfiles,oddlord/dotfiles