Hi Jalel and to BC, and to Linux.
As NickAu has suggested, please start a new Topic, with a suitable subject title.
First thing you should let us know is:
Q. What version of Ubuntu are you using?
Reason I ask is that
unity --reset
used to work with Ubuntu 12.04 and before, but from 12.10 onwards it was deprecated to:
unity-reset
... note the syntax, and if using, copy and paste exactly.
Also, over there (the new Topic)
sudo apt-get install ubuntu-desktop
used to fix a lot of problems, is that still so, Nick?
Anyway, get that Topic started and the Ubuntu experts will help further.
I am very good at blowing Ubuntu up and creating something radically different, but I will watch with interest.
Good luck, and enjoy Linux.
Wizard