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I was having problems installing MongoDB with NPM and I found someone saying that the problem is related to the fact that I had Python 2 and 3 installed. So I removed Python 3 and after this many Ubuntu apps disappeared.

After rebooting, Unity stopped working and I can't open terminal, view my apps, etc.

I've reinstalled unity and also tried to install gnome, but it still doesn't work.

What do I have to do?

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i recommend you to switch to GNOME environment from unity as the same problem was faced by me to and i got away from it by downloading gnome version of 14.04 you can download it from – agha rehan abbas Jun 18 '14 at 9:40
I've seen several options to solve the problem. In my case the Unity plugin being disabled was the problem:… I solved it in this way:… – Damian Nadales Jun 18 '14 at 9:51
I already have compizconfig manager and tried to run ccsm but it throwing an error (I'll check the error message when I get home to add to the question). – Juliano Nunes Silva Oliveira Jun 18 '14 at 10:11
Try this answer to a similar question that happened while running Ubuntu 13.04:… – karel Jun 18 '14 at 10:16
This happened to me to, what I ended up doing is reinstalling Unity and Gnome from the shell and running an open command for showing the desktop. I had a friend walk me through it and don't remember much, but I hope it helps. – user294627 Jun 18 '14 at 10:21

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