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