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How do I recover from an nvidia graphics driver update. It prevents my system from booting to the desktop. I have been reading and trying dozens of so-called "fixes" for days and NONE of them allow me to get beyond where it says "mountall: disconnected from Plymouth". Even the Live CD desktop is unviewable. Do I need to reinstall and skip the update next time? or what? I am using 12.04 LTS with Nvidia GeForce 7025 / n630a. Thank You for any real help, if there is any.

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This may not be related to the nVidia drivers update. Did you update anything else besides the drivers? Also, you might add some of the things you've tried. That really does help narrow things down. –  Richard Aug 23 '13 at 1:40
Since it has been two days, I can't possibly remember what was in those updates except that I remember one saying something about nvidia. I see the update notification just about every weekday and always run updates without any harm until now. Updates are supposed to be good, aren't they? –  Dan Aug 23 '13 at 2:14
I didn't mean to end that last comment there. I want to add that I haven been trying the "fixes" regarding installing current nvidia drivers, installing something called "nouveau", renaming something called xorg.conf (which my computer didn't have), and even deleting then recreating the swap file, all to no avail. –  Dan Aug 23 '13 at 2:22
What update did you do exactly, and how (via 'Additional drivers'? from a proprietary Nvidia tarball?). If you installed a driver version from 'Additional drivers' and can now not get back to a GUI to revert it, then you can try running jockey-text from the command line as described here --> askubuntu.com/questions/335285/… –  steeldriver Aug 23 '13 at 2:35
OP cannot get to a GUI, and the update was probably a kernel update. –  Richard Aug 23 '13 at 2:42

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