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I upgraded my Ubuntu 11.04 Oneric to the latest version Ubuntu 12.04 LTS this morning, but after installing all upgrades & cleaning up (Upgradation steps), when it restarted first time to complete installation, it got hang. Then I removed VGA cable of external display attached to my laptop & did a hard reboot then booted successfully and again when I connected other display, it got stuck again.

NOTE: I did upgrade to 12.04 LTS with 2nd display connected & that combo was working well with 11.04 Oneric.

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As suggested here I deleted my ~/.config/monitors.xml file. Now it came up with clone display working. – Vinod K May 11 '12 at 13:53

I had the same problem and the "fix" for this is to revert back to an older version of xserver-xorg-input-evdev until a proper fix is implemented.

  1. Download the following two packages to your desktop:

xserver-xorg-input-evdev-udeb_2.6.99.901-1ubuntu3~lp921236_amd64.udeb (24.0 KiB)

xserver-xorg-input-evdev_2.6.99.901-1ubuntu3~lp921236_amd64.deb (38.0 KiB)

  1. Open a terminal and execute:

    cd Desktop

    sudo dpkg -i *.deb

  2. Restart your computer or if you are lazy just restart the X Server with ALT+PRINTSCREEN|SysRq+K

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Launchpad bug: – Jonathan Kim Jun 12 '12 at 13:36
Wouldn't the dpkg command not process the first file as it has a different file extension? – hexafraction Jun 13 '12 at 17:19
Be careful suggesting sudo dpkg -i *.deb. The user may have some deb files on desktop. – Ragnar123 Jun 14 '12 at 10:07

If you are having AMD graphics, I would suggest you to do a clean install rather than the upgrade, I too have a dual monitor setup. Also use your Catalyst settings to setup dual display,Use the open source driver,It will be better and I hope you won't face any more problem after that.

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