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Answer : The issue happens when you open a RDP connection. Just bring the RDP window in foreground and press Alt + Enter . The issue will disappear on all other windows too Source: How to Fix Alt Gr Key Not Working. In my case left Shift + Caps Lock + AltGr helped. I have no idea what it does, but it works. Some utility programs can also "steal" the keyboard stroks. In my case it appeared that the VirtualDesktopManager resulted in non-functional AltGr, so I could not write [ and ] .

Answer : This answer has screenshots for Gnome-Shell (Ubuntu Gnome 13.10). I suppose it will be similar for standard Unity, but if not, please chime in. First of all (and this is the most common problem), to have AltGr working you need a keyboard layout which uses it . For example, this is my keyboard layout (Settings -> Region and Language): English (US, international with dead keys) has AltGr. English (US) has NO AltGr. English (international AltGr dead keys) has AltGr. (My preferred layout is the third one, really). If the layout does not map AltGr+Key to anything, like for example the default "English (US)", AltGr will not work even if it's activated in the Keyboard -> Shortcuts panel. This is normally sufficient. To change the position of the AltGr you go to Settings -> Keyboard and set the "Alternative Characters Key": For example, my keyboard has no physical AltGr key, so I mapped it to the Right Alt key. Now with the t...