setting linux terminal apps to keyboard shortcut [duplicate]

The shortcut is still there for what I know.

There is perhaps some other application hiding that shortcut?

Ctrl+Alt+T is not assigned by default as a shortcut key in Natty Narwhal. You can assign it manually to open the Terminal though by using the "Keyboard Shortcuts" application.

For 14.04 release, (for Unity) unity-settings-daemon or exactly its media-keys plugin handles terminal launcher shortcut.

$ dconf read /org/gnome/settings-daemon/plugins/media-keys/terminal
'<Primary><Alt>t'

System Settings → Keyboard → Shortcuts → Launch Terminal

(for Gnome) gnome-settings-daemon same as its fork unity-settings-daemon. Otherway using Compiz, it has a setting in Gnome Compatibility plugin:

ccsm → Gnome Compatibility → Commands → Open a terminal