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Ok so here is the problem in short: I run ubuntu 14.04 LTS with two desktop environments: Gnome which i usually use and spectrwm. I removed gnome (followed instructions from somewhere) and left out with spectrwm. I accidentally ran the following command: "sudo apt-get remove unity* ubuntu-desktop" Which caused a disaster (cant access any desktop environment even spectrwm, running on low graphics mode, ...) so how do I revert my last command ? By the way I tried to reinstall ubuntu-desktop and it gave me unmet dependencies errors, I did not try installing any unity package because I do not know which packages got removed because of this command.

Thank you all I really appreciate your help.

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marked as duplicate by bodhi.zazen, Eric Carvalho, Mitch Jun 21 at 8:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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what happened is the command matched the two expressions unity* and ubuntu-desktop* to all possible packages, selected all matching packages to be removed and also removed those packages which are dependencies of above selected packages. This would be a big blow to the system, so no wonder it went into low graphics mode. What you have to do is check the logs, see which packages were removed and install them. –  Registered User Jun 20 at 12:15
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Run sudo apt-get update then try again. If you still have unmet dependencies, see the link I gave you and update your question with the exact command and output . –  bodhi.zazen Jun 20 at 12:15
    
@bodhi.zazen I don't think these questions are dup –  Registered User Jun 20 at 12:15
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@RegisteredUser - apt-get handles dependencies, so there is no need to check the logs. If you do not follow the duplicate question, and resolve the dependency problem, you will continue with an unmet dependency error. The link I gave as a duplicate is how to solve unmet dependencies. –  bodhi.zazen Jun 20 at 12:18
    
I tried everything in that link and did not work :) –  Hussein Hammoud Jun 20 at 13:10

1 Answer 1

To find all unity packages that where removed type this command:

dpkg --list | grep -P '^rc  unity.*' | awk '{print $2}'

You need to reinstall all those. After that install the package ubuntu-desktop again with:

apt-get install ubuntu-desktop
  • dpkg --list list all the packages that are installed or where installed and removed (with apt-get remove )
  • grep -P '^rc unity.*' lists all packages with state rc (removed) and start with unity
  • awk '{print $2}' prints only the package name
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Can you please explain the first command ? –  Hussein Hammoud Jun 20 at 12:29
    
@HusseinHammoud see my edit, I also had a typo in the command, now it works. –  chaos Jun 20 at 12:34
    
Thank you. Just One more question, when I removed unity and ubuntu desktop, it did remove many more packages and dependencies, do I need to install them ? –  Hussein Hammoud Jun 20 at 12:46
    
Yes you removed many other packages. And they will be installed again when you reinstall the unity and the ubuntu-desktop packages. dpkg --list | grep -P '^rc' lists all packages that are removed. That could also be a important for your repair process. –  chaos Jun 20 at 12:50
    
one of the packages that the command output gave me an error upon trying to install it using apt-get. Details: sudo apt-get install unity-control-center. Gave me the following error: The following packages have unmet dependencies: unity-control-center : Depends: unity-settings-daemon but it is not going to be installed E: Unable to correct problems, you have held broken packages. Any ideas ? Thank you –  Hussein Hammoud Jun 20 at 13:07

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