Can't start Linux after entering password (black screen with mouse only)

[varum]

I have the following issue - after entering my password a black screen appears and I can see only my mouse. My version is 17.2
What can I do? I want to start it without damaging any programs and files I have.

[varum]

Please, don't you have any suggestions?

[minitux]

Try to create a new admin user
At the login screen typ Ctrl+Alt+F1 and log with your credentials, then

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sudo adduser newusername

this requires your actual password and then two time new password for newusername, and a list of answers that You can ignore pressing enter.

At the end, typ

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sudo usermod -a -G adm,cdrom,lpadmin,sudo,sambashare,dip,plugdev newusername

Then try ti re-login in graphic mode with Ctrl+Alt+F7 and select the newusername and typ his password.