I need help figuring out why the 1st "Kernel" section of boot time shown by "systemd-analyze plot" is 67 seconds long. How do I debug that part of the boot process?
I've been looking around and see a lot of posts discussing various things that either don't apply to my system or didn't make much difference.
-- apt-daily.service was running during boot so I followed instructions to create an override.conf file and removed it from the boot sequence. No real improvement, but it's not part of boot anymore.
-- I see reports about bugs in the 4.15.0-24 kernel but I run 4.15.0-43-generic.
-- I see discussions about swap partitions, but I don't have one. Posts I read say 18.04 uses swap files and they are just fine vs. having a swap partition.
-- When I run "systemd-analyze critical-chain" the first several entries (starting with "graphical.target") all end in @52.342s but I'm not sure what they mean.
-- The top several entries from "systemd-analyze blame" are
------- 31.636s for lightdm.service
------- 31.625s for plymouth-quit-wait.service
------- 14.750s for dev-sda1.device
------- 9.733s for systemd-journal-flush.service
------- and then it's keyboard, network, disks and stuff under 7 seconds each after that.
-- I like hibernation so I didn't play with the "noresume" setting in Grub.
This problem started when I decided to try 18.04 on a spare laptop. I reformatted the whole 750GB drive into one single EXT4 partition by rewriting the previous partition table. That worked fine and I installed 18.04 from a live CD.
I previously ran 16.04 and 18.04 on this same machine with no problems. The first version of 18.04 was an update from 16.04 but had functional problems. I decided to retry 18.04 as a clean install on a clean disk and that's when the speed problem started.
So, any ideas how to figure this out? I want to lend this laptop to a friend as a trial step into linux and having a long boot time like this will be a turn off for him.
