Unity is broken after Parallels Tools installation in Ubuntu 14.04

Symptoms

Unity is broken after Parallels Tools are installed or reinstalled in your Ubuntu 14.04 virtual machine.

Resolution

1. Start your Ubuntu 14.04 virtual machine and press Ctrl+Alt+F2 to activate the command line

2. Enter your username and the password

3. Locate xorg.conf.XXXXXXXX (where XXXXXXXX is the date when the xorg.conf file was created):

   ls -l /etc/X11/
   

   Check whether this file contains "Parallels" entries

   vi /etc/X11/xorg.conf.XXXXXXXX
   

   It should look like this:

   

   Press CMD+Z to exit vi

4. Type in:

   sudo mv /etc/X11/xorg.conf.XXXXXXXX /usr/share/X11/xorg.conf.d/xorg.conf
   
   export DISPLAY=:0
   
   gsettings reset org.compiz.core:/org/compiz/profiles/unity/plugins/core/ active-plugins
   

   Press Ctrl+Alt+F7 to exit the command line

5. Reboot your virtual machine.