[Bug 1663645] Re: Installation hangs at 66% "Installing GRUB boot loader"

[Thomas]

I have the same problem on a Fujitsu TX150 S7 with Xeon X3450.
Installing with mdadm on two SSDs. Going to leave it overnight as well
and will see what happens. The last debug messages are

os-prober: debug: running /usr/lib/os-probes/50mounted-tests on /dev/sdb1 [this is the second member of the mdadm RAID1 array]
50mounted-tests: debug: creating device mapper device /dev/mapper/osprober-linux-sdb [cuts off]

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https://bugs.launchpad.net/bugs/1663645

Title:
  Installation hangs at 66% "Installing GRUB boot loader"

Status in os-prober package in Ubuntu:
  Fix Released

Bug description:
  When installing Ubuntu 17.04 (daily image) in ppc64el VM, after
  selecting the LVM guided installation, the installation hangs at 66%
  "Installing GRUB boot loader".

  The same issue occured with Debian few days ago: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=853187
  It appeared the issue came from os-prober: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=853277

  The issue was fixed in os-prober 1.74. I've noticed that is os-prober
  1.73ubuntu4 in the daily image.

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