Comment 98 for bug 1574120

This occured to me today, seemingly after no update for changes made to my laptop. I fixed in in the following way. Hope this helps someone...

What did not work: Running the latest update, installing kernel 4.8.x or 4.4.25, or any of the fixes you can find doing a google search for kubuntu 16.04 suspend. I had finally tried a commond line common pm-suspend, which caused the laptop to freeze and then freeze on booting.

I have dell vostro 3500 laptop.

What worked: I reinstalled the kubuntu 16.04.1 base. I have a separate /home partition so that was not effected by the reinstall (i didn't format it. just specified to mount /home in the install setup).

reinstall was fast. After install finished, I also ran the update... to kernel 4.4.0-62-generic. I did not test the suspend here. I installed powernap and cpufreq, then rebooted. Later I closed the lid and the computer suspended. All set and it works fine.

Not sure what was the exact problem was or the fix.