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At some day my desktop environment gone when i started up my PC. I've tried to update than upgrade it but it didn't worked. Did someone faced with this problem too? Is there any way to solve it? My Panel is still there but neither my desktop wallpaper nor my desktop icons aren't there.

After a long research i managed to find a solution, that the desktop wallpaper and icons appears when the code 'xfdesktop' have been written in terminal. I guess that i have to find out how to automaticly run this code at the boot up.