[ubuntu] System doesn't log in properly

Hi,

I'm quite new to Ubuntu and I have really weird problem. During system update (I use 16.04) and installation of some apps, by mistake I entered 'stop' in terminal. This caused disappearance of 'sidebar' and the upper one, I can compare it to killing 'explorer.exe' in Windows. Some apps disappeared (system update too), I couldn't switch between windows (Alt+Tab) or use any other schrouts (e.g. Ctrl+Alt+Delete). Then I rebooted computer. It ran properly, everything was OK. I updated system, it told me to reboot, so I did. System booted properly, but after logging in there weren't bars, Super key or schrouts didn't work (as before); I can say that on-screen keyboard worked. Hence I rebooted a few times, I upgraded system by

Code:

sudo apt update

and

Code:

sudo apt upgrade

then rebooted. The same occured. So I tried every option in recovery mode, but nothing helped. Can anyone help me?

Thank you

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[ubuntu] System doesn't log in properly