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I was using Ubuntu 11.10 and installed the KDE Desktop and I was happy with that. But I wanted to get my old login screen back so I removed the package kdm. When I boot my PC now, it keeps booting and nothing happens.

How can I add the kdm package again? I got into recovery mode, terminal and tried to execute sudo apt-get instal kdm but I got an error message.

W: Not using locking for read only lock file /var/lib/dpkg/lock
E: Unable to write to /var/cache/apt/
E: The package lists or status file could not be parsed or opened

I'm pretty desperate now, could somebody please help me?

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You can show the correct message with LC_ALL=C sudo apt-get install kdm. I think it could be a read-only mount problem. –  enzotib Dec 25 '11 at 15:36
    
@enzotib Thanks, I updated the error message above! Do you have any idea how I can fix that? –  js-coder Dec 25 '11 at 15:41
    
I cannot remember just now how recovery works, so my tentative would be to remount / in rw mode, with mount -o remount,rw / –  enzotib Dec 25 '11 at 15:43
    
Have you tried booting normally, going to tty1 with Ctrl-Alt-F1, logging in and starting the GUI with startx? –  enzotib Dec 25 '11 at 15:48
    
@enzotib Thank you so much, you helped me so much! :) I suggest you make a new answer about the tty1 approach, I will accept+up vote it then. –  js-coder Dec 25 '11 at 16:07
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I suggest you to go to tty1 with Ctrl-Alt-F1, log in and then start the GUI with startx.

At that point you can reinstall the package kdm.

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If you need to install package in recovery mode, you can first ask for repairing packages (it will mount / in rw mode as suggested by enzotib) and then, when you use the root terminal, you will be able to install new packages and avoid the error you mentioned.

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