lensesshortcut-keys
The keyboard shortcut to change lenses in 12.04 has changed from being Tab to being: Ctrl+Tab and Ctrl+Shift+Tab. As answered in this question: Keyboard shortcut for switching lenses
I can see that this was probably done to improve navigation as you can now choose which direction you want to navigate through the lenses, however I'm a bit stuck in my ways and would like to know if the behaviour can be switched back so that just Tab switches lenses.
This was my problem too. Alt+<key above tab> didn't work to switch windows in the current application.
In addition, when i pressed and held down the super key to see the unity shortcuts, normally one would see this:
I'm assuming that is for a US keyboard? I stole the screenshot from another post, and on my danish keyboard it now shows Alt + Onehalf.
But when I had this problem, I did not see the line pointed to by the red arrow!!!
So check if you see a keyboard shortcut for "Switch windows of current application". If you don't this is for you:
The fix was as hinted at above to change the XKBMODEL setting in /etc/default/keyboard where I changed from XKBMODEL="microsoft4000" to XKBMODEL="pc105".
I did that and ran sudo dpkg-reconfigure keyboard-configuration. Not sure this last step was required.
Then I needed to reboot.
Now it works.
Finally I've found a solution.
It appears, that you need to manually edit settings with the dconf-editor (dconf-tools package).
To edit workspace keyboard binding one should use dconf-tool and edit settings under path org -> gnome -> desktop -> wm -> keybindings.
The syntax for keybindings is the same as in other Gnome editions and the same as displayed in "System Settings->Keyboard->Shortcuts".
Best Answer
These key combinations are hardcoded into the Unity plug-in for Compiz and are not exposed as options that can be changed through a configuration setting. To change them, you would need to recompile your own version of Unity.