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After I installed experimental Nvidia drivers, Ubuntu will not boot. How can I remove the drivers from recovery mode?

If I choose recovery mode and in the menu choose "root" (drop to root shell prompt), and then try to use the command sudo apt-get remove --purge nvidia-*

it says:

sudo: unable to open /var/lib/sudo/thakang/console: read-only file system

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 have used login and logged in so my shell now shows :~$

Thank you

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possibly related: about stalling fsck in recovery mode. – guntbert Feb 3 '13 at 20:43

You need to mount your system first in read/write mode:

mount -o remount,rw /
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