I have this problem:
when linux is already loaded I can only see the screen absolutely black but I can move the cursor even if nothing happens.
During the loading process there is following message: "temporary failure in name resolutions"but I don't know if this problem is linked to the situation explained above.

Please help me!

Welcome!
Are you saying that the screen is black/blank? Is the cursor flashing? Is it a log in prompt? The name resolution has to do with networking and your device getting an ip address.