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I was running Ubuntu 12.04 LTS and was accepting all suggested upgrades. About a week ago I was prompted to upgrade the Hardware Enablement Stack because it was going out of support. So I did and I upgraded to 12.04.5. Unfortunately this upgrade brought multiple problems to my computer: if I send computer to sleep it does not recover, and if I shut it down, it restarts automatically for now apparent reason.

Now I want to undo the upgrade that I made last week. Is there a simple way to do that?

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HWE is nothing but a new kernel. When you pick an older kernel during boot (see the options GRUB shows you) you are using the older HWE stack. – Rinzwind Aug 11 '14 at 14:21
    
@Rinzwind, this is not true, i checked with glmark2 benchmark (see my question here). – Alexey Feb 20 '17 at 15:47
    
At least, it is no longer true with 16.04.2. – Alexey Feb 20 '17 at 15:54
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The correct way to downgrade is to remove the unsupported packages this can be done with the following command sudo apt-get remove $(hwe-support-status --show-all-unsupported) which feeds the unsupported packages to apt for removal.

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Additionally, just booting an old kernel won't have you running the older Xorg packages and may cause issues with your graphics. – Brian Murray Sep 6 '16 at 21:37
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same here... what I did to revert is described here:

sudo apt-get install --install-recommends linux-generic-lts-saucy xserver-xorg-lts-saucy libgl1-mesa-glx-lts-saucy

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