Usually I'm using three languages: English, Russian, Ukrainian. So, after Xubuntu was installed in my VM I went to keyboard settings and added Russian. After that I found that when I'm switching from first layout to second - it works, but when I'm pressing Alt+Shift again - nothing happens. So it stays on second layout. I added keyboard switching element to tray and this is the only way I can switch layouts normally - by mouse. DistroRelease: Xubuntu 16.04 LTS x86/x86_64 Uname: Linux 4.4.0-22-generic x86_64 This report on launchpad: https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1581687 For any additional info, please ask.
Found this issue affected not only Xubuntu but the other distros too. And only as guest VM. So this report is obviously invalid.