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I changed from an ATI 5450 video card to a nvidia GeForce 620 card and now I cannot boot to the login screen or start x.

Before I removed the ATI card, I removed any proprietary drivers and was only running the open-source drivers. I followed this guide: http://wiki.cchtml.com/index.php/Ubuntu_Precise_Installation_Guide#Removing_Catalyst.2Ffglrx

Then I changed the video cards. Now when I try to boot, I just get a black screen with a blinking curser.

If I boot into recovery mode, start a root shell prompt, and run startx a black screen appears with a small graphical dialogue box that says “failed to load session gnome”. (I first have to run mount -o remount,rw / for the startx command to work.

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I've ran sudo apt-get install xserver-xorg-video-nouveau and confirmed the open-source drivers are there.

I tried to install the proprietary video card drivers from the command line as well, but when I try to add the x-swat/x-updates ppa I get the error:

pycurl.error: (6, “couldn't resolve host 'launchpad.net'”

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I know the card works with my computer because it works fine on my Windows 7 partition. I am running 12.04 64 bit on a Dell XPS desktop. I would really appreciate some help with this.

Thank you

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