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67d34a1
(Get the code!)
I had been running Ubuntu 16.04 LTS on many laptop computers (especially Dell D620, D630, E6400) with no problem.
I created a Live USB with Ubuntu 16.04.2 LTS and tried it on a Dell D630. It was very slow to boot up (about 90 seconds) as opposed to the 30-45 seconds it usually takes. For a few seconds there were error messages that included the phrase "flip_done timed out".
When the Ubuntu desktop appeared, the mouse cursor hung for a while, but then came back to life. I didn't do much testing from there. I did a Live session with the 16.04.2 LTS on a different D630 laptop, and the same problem occureed.
I Googled the problem, and found several hits.
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On an Arch forum, someone reported the problem on a Dell D630, like mine. It also occured on other laptops:
https:/
The suggestion was that the bug was related to kernel version 4.8.x and the 965GM chipset, which is what the D630 has.
So I tried Ubuntu Mate 16.04.2 on a Dell D620 (with a 945GM chipset) and the problem DID NOT occur.
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For a similar boot-up problem, Ubuntu Forum suggested going back to an earlier version of Ubuntu.
https:/
I tried Ubuntu Mate 16.04.1 (with the 4.8.0-31-generic kernel), and the problem did NOT occur.
So I'm solving the problem for myself by using Ubuntu Mate 16.04.1 LTS (with the 4.4.0-31-generic kernel).