InstallationMedia: Ubuntu-MATE 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215) InstallationDate: Installed on (0 days ago) So I'm solving the problem for myself by using Ubuntu Mate 16.04.1 LTS rather than 16.04.2. I tried Ubuntu Mate 16.04.1 (with the 4.4.0-31-generic kernel), and the problem did NOT occur. So I tried Ubuntu Mate 16.04.2 on a Dell D620 (with a 945GM chipset) and the problem DID NOT occur.įor a similar boot-up problem, Ubuntu Forum suggested going back to an earlier version of Ubuntu. The suggestion was that the bug was related to kernel version 4.8.x and the 965GM chipset, which is what the D630 has. On an Arch forum, someone reported the problem on a Dell D630, like mine. I Googled the problem, and found several hits. I did a Live session with the 16.04.2 LTS on a different D630 laptop, and the same problem occureed. When the Ubuntu desktop appeared, the mouse cursor hung for a while, but then came back to life. For a few seconds there were error messages that included the phrase "flip_done timed out". It was very slow to boot up (about 90 seconds) as opposed to the 30-45 seconds it usually takes. I created a Live USB with Ubuntu 16.04.2 LTS and tried it on a Dell D630. I had been running Ubuntu 16.04 LTS on many laptop computers (especially Dell D620, D630, E6400) with no problem.