UEFI model PC using CMS coult not update ubuntu-18.04.2

[Seiichi Nakashima]

Dear everyone

I install ubuntu-18.04.1 japanes edition from iso image.
I have some PCs, installed same ubuntu.

UEFI model(asrock H110M-HDV P7.60) using CMS(Compatibility Support Module),
it can install ubuntu-18.04.1, but software update to occur snapd.snap-repair.service is
a disabled or a static unit, not starting it. I search ask-ubuntu, and find resoled it.
but this PC can not start ubuntu at power on, and shutdown long time.
before update (onle ubuntu-18.04.1) work fine.

UEFI model not using CMS, it can install ubuntu-18.04.1 and update 18.04.2 work fine.
BIOS only model PC, it can install ubuntu-18.04.1 and update 18.04.2 work fine.

UEFI model using CMS only could not update ubuntu-18.04.2.
what thing I need to do.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1821480/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Seiichi Nakashima (ubuntu-linuxer)]

UEFI model PC using CSM(Compatibility Support Module),
I restored backup file 2019-93-02, It may work fine.

[Seiichi Nakashima (ubuntu-linuxer)]

My disk partition
UEFI model PC using CSM use mbr.
UEFI model PC not using CSM use gpt.
BIOS PC use mbr.

[Seiichi Nakashima (ubuntu-linuxer)]

Today I update UEFI model PC using CSM, restored backup from 2019-03-02.
use software-updater, and update normal.
but PC shutdown could not power-off(I force power-off by switch)
and power-on PC, and show /var/log/syslog, I found same error 1814364.

<https://bugs.launchpad.net/bugs/1814364>

[Seiichi Nakashima (ubuntu-linuxer)]

Today I update UEFI model PC using CSM, restored backup from 2019-03-02.
use software-updater, and update normal.
and PC shutdown problem occur again.

I force power-off/power-on by switch, and I select kernel
4.15.0-46-generic to 4.15.0-45-generic, so boot up normal.
then I check syslog file, a lot of ureadahead[264] messages
in two seconds.

[Seiichi Nakashima (ubuntu-linuxer)]

I update software updater to update developer option update.
kenel update to 4.15.0-47-generic.
shudown and power-on up need a lot of time.
and a lot of ureadahead found in syslog.

[Seiichi Nakashima (ubuntu-linuxer)]

I use ubuntu-18.10 kernel and xstack, then update to use sofrware-updater.
my ubuntu environment shutdown/power-on trouble cleared.

apt-get install --install-recommends linux-generic-hwe-18.04 xserver-xorg-hwe-18.04