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I've upgraded from ubuntu 12.04 to 14.04. There were display driver issues and I could only work in a terminal. I have installed the nvidia drivers from here. During the installation there seemed to be some conflicts with the existing installations nvidia-304* and was prompted to remove them and install the new drivers instead. Now, when I reboot the nvidia logo flashes a few times then nothing happens; there is a cursor on the top left of the display.

Typing:

Ctrl + Alt + F1

does not produce any result. I have dropped into the recovery mode root console and have tried to remove all nvidia installations by running:

sudo apt-get autoremove nvidia-304*
sudo apt-get --purge remove nvidia-304*

The following is displayed:

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.

Also, networking is disabled. How is it possible to reinstall the drivers?

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