How to set a shortcut for "Always on Top" for window?

In 12.04 (Unity), I would like to assign a shortcut to the "always on top option" for a window. Probably something like Ctrl+Shift+Home to turn on and Ctrl+Shift+End to turn off, or whatever. Is there an option to do this somewhere in the Compiz Settings Manager?

This (old) post claimed that

For compiz, Enable Extra WM Actions. Check the properties, and insert ALT+A to Key field for Toggle Always-On-Top action.

But I couldn't find that.

It should work on every Ubuntu OS since version 9.04 without installing anything, modifying of creating any shortcuts.

Try Alt + Space, T

• Alt + Space as the first shortcut brings up the right-click mouse menu

• T selects the "Always On Top" function.

Since no one has mentioned this yet, I'll just leave a solution that worked for me on Ubuntu 12.04.

You could setup a regular keyboard shortcut and use wmctrl to toggle the "Always on Top" option.

Go to System Settings > Keyboard > Shortcuts > Custom Shortcuts. Hit the + and give your shortcut a name. Then enter the following command.

wmctrl -r :ACTIVE: -b toggle,above

If you don't have it already, you can install wmctrl from the repos using

sudo apt-get install wmctrl

You should have something that looks similar to this.

Hit apply and you should be good to go!

This solution came from a discussion on Ubuntu forums.

Unity instead of GNOME (Ubuntu before 17.04)

If not install CCSM and extra compiz plugins via:

sudo apt-get install compizconfig-settings-manager compiz-plugins-extra

Be aware please. CCSM can kill Unity3D on some systems.

If you have not had compiz-plugins-extra already installed, you need to restart Compiz to load them (even though they display in CCSM just fine before the restart) with Alt+F2 and

compiz --replace

You can see Extra WM Actions under Windows Management section on CCSM as explained in the post you found. You can set the desired action there easily.