[Bug 1770173] Re: 18.04 install stuck on grub install

[Mike Tallroth]

Ok, new experiment. I'm including the steps here and in an attached
README along with outputs captured at various points in the process in a
tar.gz file.

I've moved drives around throughout this debugging process, but for this experiment they were;
/dev/sda - 80GB spinner (os install drive)
/dev/sdb - ZFS USB drive (problem drive)
/dev/sdc - ext4 USB drive (data drive to transfer output files)

Let me know if there are variations in the process I should try.


miket$ cat README 
Auto Install up to "Install the GRUB boot loader on a hard disk" step
Alt-F2
nano /target/usr/bin/os-prober (-ex)
nano /bin/os-prober (-ex)

./step1
/target/usr/bin/os-prober > os-prober.log 2>&1
ps > ps.log
cp /var/log/syslog .

Alt-F1
Proceed with auto install of GRUB to /dev/sda
Wait until it is stuck at 66% for about 1 minute
Alt-F2

./step2
ps > ps.log
cp /var/log/syslog .

./step3
/target/usr/bin/os-prober > os-prober.log 2>&1
ps > ps.log
cp /var/log/syslog .


** Attachment added: "experiment.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/os-prober/+bug/1770173/+attachment/5157000/+files/experiment.tar.gz

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https://bugs.launchpad.net/bugs/1770173

Title:
  18.04 install stuck on grub install

Status in os-prober package in Ubuntu:
  Incomplete

Bug description:
  Installation freezes on grub install at 66%. syslog shows grub-install
  ran successfully, then seems to have actually gotten stuck in the next
  step (osprober). Photo attached, sorry for the terrible quality from
  HTC.

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