Are there any Keyboard Shortcuts to Shutdown?

No, but assuming you're using 11.10, one can easily be added by going to:

1. System Settings
2. Keyboard
3. Shortcuts tab
4. Custom Shortcuts
5. Then the little + icon.

You can give it the name "Shutdown", and the command. Try the command below:

gnome-session-quit --power-off --force

, then apply whatever keyboard shortcut you want to it.

Yes there is shortcut to shutdown (not a keyboard one).

Shortly pressing and releasing the power button will call the shutdown dialogue box.

You can try this steps as well:

1. Press Alt+F10.

2. The file menu will get displayed in the top.

3. Use the Right Arrow key in your keyboad and go to extreme right (Pressing Left Arrow might also work and be much faster).

4. Select the shutdown in from the menu and hit enter.