Since upgrading to 12.10, sometimes "Switch Applications" does not work.
Pressing Alt+Tab works as pressing only Tab key.
And it does not work even if I change the shortcut key to Ctrl+Tab or any other.
As an alternative you can try installing CompizConfig Settings Manager
by using a terminal (CTRL+ALT+T):
sudo apt-get install compizconfig-settings-manager
or by using the software center:
and select Application Switcher
or Static Application Switcher
from Window Management
group.
Static Application Switcher
is now in a separate package called compiz-plugins
Mar 23, 2013 at 6:41