Comment 3 for bug 1615222

I reinstalled ibus, which caused system settings to disappear. While mucking about with that an update was announced, but it did not seem to have anything to do with input bus. I went ahead an applied it. To resolve the system settings issue I reinstalled ubuntu-desktop

$ sudo apt-get install ubuntu-desktop

I then rebooted the laptop. Unfortunately this did not end up being a very deterministic approach to troubleshooting this issue. However, after reboot, the keyboard is working correctly again.

Teď můžu klavesnici použivat jako dřív. Mňau!

Something went wrong during the upgrade, but since 16.04 has been out now a few months, it is probably something peculiar to my system. You might want to close this with no change.