Problem when logging
 

I receive this after I try to log:

Could not look up internet address For I
This will be prevent GNOME from operating correctly.
It may be possible to correct the problem by adding
I to the file /etc/hosts.

Log in Anyway Try Again.
Somebody has idea??

Gnome just isn't able to resove "I". Just do what it says and add an entry for "I". It is probalby your hostname. Syntax like that:
IP-Address name.domain name