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I have been playing around with compiz settings, and I apparently did something that is making compiz (and therefore unity) not start when I log in. Is there a compiz settings directory somewhere I can delete to restore default settings and get unity back?

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did you try unity --reset ? – severin Nov 24 '11 at 19:14
possible duplicate of Unity doesn't load, no Launcher, no Dash appears – Jorge Castro Jan 17 '12 at 6:56

This is not definitive, but I have had luck doing the following:

  1. Log into Ubuntu 2D.
  2. remove ~/.compiz-1 folder (~ being your /home/userid directory. In Nautilus, show hidden folders that start with a "." by hitting "ctrl + h")
  3. remove ~/.cache/compizconfig-1 folder
  4. in a terminal (or probably with "alt + F2"), type unity --reset
  5. this unity --reset never seems to fully complete at least for me, so I force close the terminal.
  6. restart

Now free to log into Ubuntu (default 3D). Everything seems back to normal in compiz and with Unity.

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unity --reset should never close, as it becomes the running unity instance. Only if it fails badly would it be expected to "finish". Do you mind if I edit your post to remove that step? (If you're going to restart, it really doesn't matter whether or not you quit the running unity instance first, though doing so is a bit strange.) – Eliah Kagan Nov 25 '11 at 1:07

u can login through unity 2d . after that go to ccsm and click on the unity plugin checkbox it will tell u about conflicts, approve it and click on the middle option in all the conflict resolution dialogs, after that restart and login to unity(3d).

it may help.

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