Ubuntu 12.04/12.10 shutdown/startup problem

There is a bug listed on launchpad, Ubuntu 12.04 and some users on 12.10 where there is difficulty shutting the PC down, leaving the fan running with a black screen. I think this is also related to a start up problem I had where a purple screen would flash for a second then freeze on a black screen. There is advise on Launchpad to disable lightdm, this caused me problems and wouldn't recommend it, try this simple fix first, I think the fault lies with the graphics driver.

I removed the graphics driver first. $ sudo apt-get purge nvidia*
Older versions of Ubuntu came with "additional drivers" package installed as default, you have to add it yourself in the later versions, so open the software centre, type in "additional drivers" install, then open and install the driver (I opted for the non-experimental one) then reboot.

I've had no problems after this.

/Sones

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