Today I've forced with t problem.
I've installed Linux Debian Mint, installed some work programs and after this also i've updated my OS via update manager.
During updating I've obtained error messages that some libraries could not been installed.
After this I've reeboted my PC. Now Linux doesn't boot. Its only black screen.
But I have access to the terminal via Alt+Cntrl+F1 and I can boot via Live CD. So it seems that some vidio drivers or desctop might be broken
Could you tell me possible ways of solving this problems ? I would like to reinstalling my OS