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Hi how can i get back (downgrade) from 12.04.3 kernel and it's xservers to 12.04.2 ones? i have some problems with 12.04.3 kernel and want to downgrade.

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You should be able to remove raring kernel and X stack by running the following command

sudo apt-get purge linux-generic-lts-raring xserver-xorg-lts-raring

NOTE: Do not install the linux-current-generic package as it will install the latest release kernel (now it's raring's 3.8).

This should roll back to 12.04.2. If NOT, manually install quantal kernel and x stacks manually => sudo apt-get install --install-recommends linux-generic-lts-quantal xserver-xorg-lts-quantal libgl1-mesa-glx-lts-quantal.

Refer to: https://wiki.ubuntu.com/Kernel/LTSEnablementStack

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If you want to get downgrade the Kernels then you can get those old kernels from here

http://kernel.ubuntu.com/testing/index.html

http://kernel.ubuntu.com/~kernel-ppa/mainline/

those are having kernels and from there you can get them & install.

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