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On 10.10 I was able to make quick Video Drivers installs just by starting Ubuntu in "recovery mode", which would me allow to modify the X server. But now if I start the system in recovery mode it still starts the X server and all the service gdm stop and service lightdm stop commands won't work. gdm says it isn't a recognized command and lightdm simply turns off my screen. None of the Ctrl+Alt+F* combinations work. This is getting to my nerves.

Please! I just upgraded my system and I need to install the video drivers. Thank you!

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Please boot your computer with the kernel parameter nomodeset.

Please have a look at this great how-to for detailed instructions how to boot your computer.

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Ubuntu 11.10 uses lightgdm and not gdm.

i had to do this once and used sudo stop lightdm & sudo start lightgdm

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had to use it to have the guest account disabled.... it stated restart but this worked too and i checked it – sarveshlad Oct 21 '11 at 3:29
No. As I said, if I do a lightdm stop command my screen go blank and I have to reboot holding the power button. I want to disable the x server on recovery mode, please! – Bruno Philipe Oct 21 '11 at 15:41
This worked for me. sudo stop lightdm from the Ctrl-Alt F1 console. Ubuntu 12.04. – Captain Giraffe Aug 29 '12 at 9:53

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