I found /dev/sda3 ubuntu-18.03 syslog has a lot of ureadahead messages at 
16:50:35.
I grub-install command to use recover /dev/sda3 pbr.

I upload syslog same PC. involved all today log.
<https://www.dropbox.com/sh/w4ks9q19gd1803g/AABI2n6DSigRV_UWaJs7rUjFa?dl=0>

I update at 18:10 to use grub-install by ubuntu-18.04 livecd.
and reboot /dev/sda3 ubuntu-18.04, perhaps work fine.

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

Title:
  software updater ask grub setting repeated

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