When i press "ctrl+alt+f3" it goes in cli mode
and then when i press "ctrl+alt+f7" error loading wallpaper
All things are working properly
just my desktop wallpaper seems to be crashed
I had this problem just yesterday. I removed all my nautilus plugins, thinking that was the problem - but it seemed not to be.
In the end, I ended up noticing that the Desktop had been disabled all together. If you have GNOME-Tweak tool or Ubuntu-Tweak installed, re-enable the option to display Desktop icons, and your Desktop wallpaper will return.
Let me know if you need any further assistance in the comments.
Are you running 11.04 or 11.10?
Try restarting nautilus with:
That will quit your current nautilus session. If it doesn't restart automatically, you can run nautilus from the terminal or open a folder. This should work and be less extreme than completely restarting X.
Hope this helps!