Unity – Fix Unity Not Working After Upgrade to Ubuntu 15.10

15.10unity

Today I upgraded to Ubuntu 15.10, no errors happened during the upgrade but after the upgrade I can log in using my username and password but unity does not work. No launcher, no panel absolutely nothing just the background.

I tried to start unity myself using compiz --replace unity it gives me an error about a missing function definition in libunity.so and it fails to load.

Please can you help me with this?

[UPDATE]

output of sudo apt-cache policy libunity9 is

libunity9:
  Installed: 7.1.4+15.10.20151002-0ubuntu1
  Candidate: 7.1.4+15.10.20151002-0ubuntu1
  Version table:
 *** 7.1.4+15.10.20151002-0ubuntu1 0
        500 http://sy.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status

[UPDATE]

After trying to follow the two answers the error message has changed as follows

DISPLAY=:0 compiz --replace unity outputs to standard error

  compiz (core) - Info: Loading plugin: core
  compiz (core) - Info: Starting plugin: core
  Invalid MIT-MAGIC-COOKIE-1 keycompiz (core) - Fatal: Couldn't open display :0
  compiz (core) - Info: Stopping plugin: core
  compiz (core) - Info: Unloading plugin: core

Best Answer

You might have an answer already, try a fresh install of Unity.

sudo apt-get update

sudo apt-get remove unity unity-2d unity-2d-panel unity-2d-spread unity-asset-pool unity-services unity-lens-files unity-lens-music unity-lens-applications gir1.2-unity-5.0 unity-common indicator-sound indicator-power indicator-appmenu libindicator7 indicator-application indicator-datetime indicator-messages libnux-2.0-0 nux-tools libunity-misc4 unity-2d-common

sudo apt-get autoremove

sudo apt-get autoclean

sudo apt-get install unity unity-2d unity-2d-panel unity-2d-spread unity-asset-pool unity-services unity-lens-files unity-lens-music unity-lens-applications gir1.2-unity-5.0 unity-common indicator-sound indicator-power indicator-appmenu libindicator7 indicator-application indicator-datetime indicator-messages libnux-2.0-0 nux-tools libunity-misc4 unity-2d-common

sudo apt-get upgrade

This should restore Unity.

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