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

[Phillip Susi]

The interesting information I'm trying to get is exactly where os-prober
froze, so if it finishes correctly then that information isn't going to
help.  I think at that point in the installer if you look, you will see
the hard disk mounted under /target, and it has its own copy of os-
prober, so make sure that it has the set -ex and let the installer
install grub, and if it freezes there again ( and you should also check
ps aux | grep os-prober to see if the process is still running ), then
at that point all of the debug output should be in /var/log/syslog and
we should be able to see where it was when it froze.

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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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