Back several ubuntu versions ago I could resize the screen using Ctrl + Alt + - (For higher resolution) OR Ctrl + Alt + + (For lower resolution).
Now they do not seem to work. How can I add them again for resolution change.
I'm pretty sure this feature is gone since Bullet Proof X. However:
You can create short cuts (System → Preferences → Keyboard Shortcuts) to change your resolution:
It's not exactly the same as the old +/– business, but it works rather well.
To add a short cut, in the Keyboard Shortcut settings, click add, choose a name, like 'First Resolution', a command like
Note: this works on any graphics card, not just NVidia's.