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I installed 11.04 a few days ago and the first few boots unity loaded as expected. But now its just booting into GDM.

I did get one popup about it not being supported on my machine (After the it had booted fine 2 or 3 times!) but i dismissed it without reading it.

I've looked at How can I activate Unity? but nothing shows up in my additional drivers except for a wireless chip

the dropdown at login has ubuntu, ubuntu classic and ubuntu classic safe mode i think

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Try removeing any graphics drivers you have and installing them again – Uri Herrera May 1 '11 at 21:25
What happens when you select "Ubuntu" and login? – RolandiXor May 1 '11 at 21:38
@Uri how do i remove them? there is nothing in additional drivers @Roland i get gdm – Bruce Aldridge May 1 '11 at 22:06
sudo apt-get --purge remove nvidia-* if you have nvidia graphics, sudo apt-get remove fglrx if you have amd/ati graphics – Uri Herrera May 1 '11 at 22:13
@Uri purging them worked a treat, haven't re-installed but still seems to work – Bruce Aldridge May 2 '11 at 7:45
up vote 1 down vote accepted

Remove any Drivers that may be causing the issue:

  sudo apt-get --purge remove nvidia-* if you have nvidia graphics, 
  sudo apt-get remove fglrx if you have amd/ati graphics

to get any of them back:

If your system architecture is 64bit (x86_64), you need the ia32-libs package as well.

  sudo apt-get install ia32-libs

then for both 32 and 64bit:

  sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
  sudo apt-get update
  sudo apt-get install nvidia-current nvidia-settings

and for ATI


Once dowloaded right-click the .run file and set it to run as executable.

  sudo apt-get remove --purge xserver-xorg-video-radeon

that will remove the opensource radeonHD driver.

Now this is only if it's a 64bit system:


  sh --buildpkg Ubuntu/natty

  sudo dpkg -i fglrx*.deb

  sudo aticonfig --initial -f

For the 32bit system just run the ati installer.

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actually i've just had two nasty crashes of unity/gdm in the past 15mins, i'm guessing its related.. how do i reinstall those drivers? I've tried nvidia-{173,96}-modaliases and nvidia-{96,173} and i get the error ` nvidia-173 : Depends: xorg-video-abi-10 Depends: xserver-xorg-core (>= 2:1.10.0-0ubuntu1~) but it is not going to be installed nvidia-96 : Depends: xorg-video-abi-8.0 but it is not installable Depends: xserver-xorg-core (>= 2: but it is not going to be installed ` – Bruce Aldridge May 2 '11 at 21:32
... theres my problem ... its not nvidia – Bruce Aldridge May 2 '11 at 21:42
added more info. to know which hardware you have to open a terminal and type hardinfo, install it if you don't have it already. – Uri Herrera May 3 '11 at 3:34

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