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this question regarding the LTS Enablement Stack has actually two parts:

  1. I installed Linux 3.5.0-x on Precise 64bit via sudo apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal . As it turns out, VirtualBox does not work yet on the new kernel (EDIT: This is fixed now.). Therefore I want to remove it from the system. As expected removing the meta-packages via sudo apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal is not enough. What packages do I need to remove manually? For the kernel I would do (as of now): sudo apt-get remove linux-image-3.5.0-25-generic . However, regarding xserver-org I am lost. How can I switch back to the original xserver?
  2. I installed a system with the 12.04.2 installation media. There I have also the 3.5.0-x kernel, because that's the default for this point release. How can I downgrade to the kernel (and xserver?) to the 3.2.0-x series?

Thank you!

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Another way could be to use VirtualBox from this PPA until it gets fixed for Precise + kernel 3.5: bugs.launchpad.net/ubuntu/+source/virtualbox/+bug/1081307/… . But still I am interested how to go from 3.5 to 3.2. –  Andre Mar 9 '13 at 21:28

2 Answers 2

up vote 4 down vote accepted

Important: The below instructions only work if you have one of the pre-enablement stack kernels installed still, e.g. 3.2.0-38.

With the Enablement Stack installed run 'uname -r' to check the current kernel version. Substitute it into the command below:

sudo apt-get purge linux-generic-lts-quantal xserver-xorg-lts-quantal linux-headers-generic-lts-quantal linux-image-generic-lts-quantal linux-image-3.5.0-25-generic linux-headers-3.5.0-25

Re-install important components (including X itself!) that are removed due to dependencies by the above commands:

sudo apt-get install xserver-xorg xserver-xorg-input-synaptics

Fix the steam client:

sudo apt-get install libgl1-mesa-glx:i386

Finally, reboot your computer.

IMHO the enablement stack isn't ready for release. In my experience Virtualbox, Samba, and the Steam client all break with the Enablement Stack installed. There's a workaround for Virtualbox but none for Samba or Steam so far (March 2013).

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A procedure for your consideration:

  1. Uninstall the following packages:

    linux-generic-lts-quantal
    xserver-xorg-lts-quantal
    
  2. Install the following packages:

    linux-generic
    linux-headers-generic
    linux-image
    linux-image-generic
    linux-libc-dev
    linux-tools
    
  3. Reboot to 3.2.0-38 kernel

  4. Uninstall the packages linux-headers-3.5.0-x and linux-image-3.5.0-x.

Good luck and have fun.

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Thanks! What should I do about the graphics stack? Installing xserver-xorg-lts-quantal removes the "old" xserver-... Will it be re-installed automatically? –  Andre Mar 10 '13 at 23:07
    
Original is restored. –  cogitoergosum Mar 10 '13 at 23:24

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