I use Kubuntu 15.04. I have tried couple of times to install language selector Gnome, but it didn't work. I tried to use synaptic and Ubuntu software center. At the end of the installation process, it seems that the software is installed, but I cannot find it in my computer. I also tried to install it using the terminal, the same result.
Can somebody help me?
Update: I decided not to install the language selector. I just did what Gunnar suggested me to do. And it worked.