Unity Ubuntu Topbar disappeared

I have often seen that the Unity Topbar of Ubuntu LTS is hidden or not clean loaded after Login.
It’s Caching Problem of Unity (Compiz) and Lightdm, if the PC is not clean rebooted or started.

Howto fix:

sudo rm -fr ~/.cache/compizconfig-1 \ 
&& sudo rm -fr ~/.compiz && sudo service lightdm restart

Now relogin and check.. if ok do a Profile Backup! with:

tar -cvzf  /usb-backup-stick/compiz.tgz \
/home/username/.cache/compizconfig-1 /home/username/.compiz

Ubuntu: Unity Bug Minimize Windows freeze Unity Desktop 15.04

Bug: Minimize Windows freeze Unity Desktop 15.04

Solution: If you use Tweaks to disable or hide the Desktop Icons which are displayed by Nautilus Filemanager Unity is often freezing on maximize or minimize the Windows of Apps like Firefox or Chromium-Browser. This is NO Compiz or Graphic Chip Driver Problem! Its seen on Intel HD, Radeon or Nvidia Graphic on „fresh“ Systems!

No Log Entry’s are made!! by the System, User must often hard reset the PC or restart Lightdm Login Manager on Console!!