Ubuntu – Unity Launcher and Top Panel disappeared in 14.04

14.04unity

The top panel and Unity launcher have disappeared in Ubuntu 14.04. Also cannot access the terminal via Ctrl+Alt+T.

I have tried every solution for this issue that I can find, from re-installing unity and compiz to resetting Unity and everything. I've gone into the compiz manager and reactivated Unity.

Nothing has worked.

When trying to reset Unity, or do anything with it really, I get this message

(process:6332): dconf-WARNING **: failed to commit changes to dconf: Could not connect: Connection refused

EDIT:
Installed 14.04 a day ago. The issue happened after a reboot. After installing virtual Box

Best Answer

Enter the following commands:- Ctrl+Alt+F1 login there with username and password

WARNING! THE FOLLOWING COMMAND WILL TERMINATE YOUR ACTIVE SESSION!

try:

sudo service lightdm restart

If restarting lightdm doesn't fix the problem, install aptitude and then install unity:

sudo apt-get install aptitude
sudo apt-get update && sudo aptitude -f install && sudo aptitude dist-upgrade
sudo aptitude install unity

Read the outputs carefully. If you do have broken dependencies, aptitude will give you the "solution" of NOT installing unity. Say no to this solution. Then it will give you another solution which will install broken dependencies. Say yes to this one. Once installation is complete, sudo service lightdm restart again. If you still have some issues, also reinstall ubuntu-desktop:

sudo apt-get install --reinstall ubuntu-desktop

followed by another sudo service lightdm restart.

(Credit to @DinGODzilla from this question)

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