Language change doesn't work in ubuntu 15.04

1.I recommended you to read this Ubuntu documentation about "use alternative input source" .

It is explaining it step by step .

2.you can try reconfigure the keyboard configuration with this command

dpkg-reconfigure keyboard-configuration 

I hope it helps you.

My problem was that the shortcut for change kept setting to "Shift L" or such. I couldn't get rid of the <Mod2>.

After trying dconf, gsettings, gconftool, gconftool-2 and other, I found out in other question that I have to turn off NumLock and set the shortcut again.

See https://bugs.launchpad.net/ubuntu/+source/unity/+bug/981628