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I need to use Linux 3, becasue with Linux 2.6.x has display problems with my SandyBridge integrated graphic. On the other hand, I need to downgrade to Ubuntu 10.04/10 because Betavine packages for running my mobile broadband modem work only with Ubuntu 10.04 (and 10.10). Hence I need to make a compromise. I appreciate your hints.

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Sandy bridge works OK on the natty kernel - if you start from 10.04 - you can use this answer here to upgrade graphics and the kernel to work with your sandybridge laptop.… – fossfreedom Oct 24 '11 at 19:49
FYI, the difference from 2.6.x to 3.0.0 is nothing. It was just a version bump from Linus =P – Chuck R Feb 20 '12 at 16:23
I have 3.2.4 installed in Natty I just went to the mainline and downloaded the .DEBs – Ringtail Mar 10 '12 at 17:21

Or, as a last-ditch effort you could compile a new kernel from and use that.

To get an ubuntu-styled kernel:

apt-get source linux-image-$(uname -r)
cd linux-image-$(uname -r)
make menuconfig #Then hit exit and save the configuration
cd ..
tar -xjf linux-3.2.6.tar.bz2
cd linux-3.2.6
make menuconfig
cp ../linux-image-$(uname -r)/.config .
rm -R ../linux-image-$(uname -r)*
make install
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Maybe. There is an Ubuntu kernel PPA:

You can try download the Linux kernel 3 for Oneiric, maybe it will work.

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you can't use a oneiric kernel for a Ubuntu versions that's not Oneiric! – Alvar Feb 20 '12 at 16:19

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