I have Ubuntu 18.04. I cannot change my keyboard language. When I try with shortcut, nothing going on. When I try with clicking on the language and change it, the icon of the language changes, but when I writing the language is still English. I have only 2 languages - Bulgarian and English. I cannot switch to Bulgarian. Before 2-3 weeks everything worked fine, but now when turn on my laptop it doesn't work. I don't know what caused this. If you have some questions do not hesitate to ask.
Edit: Actually I notice that even shortcuts for opening terminal does not work, so maybe there is some global problem with the shortcuts.
Thanks in advance.