[Bug 1852041] Re: ubiquity grub-install fails with /boot on RAID, ubiquity does not install mdadm

[Jim At Your Service]

** Package changed: grub-installer (Ubuntu) => ubiquity (Ubuntu)

** Summary changed:

- ubiquity grub-install fails with /boot on RAID, ubiquity does not install mdadm
+ ubiquity grub-install fails with /boot on RAID, ubiquity does not install mdadm, workaround included

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https://bugs.launchpad.net/bugs/1852041

Title:
  ubiquity grub-install fails with /boot on RAID, ubiquity does not
  install mdadm, workaround included

Status in ubiquity package in Ubuntu:
  New

Bug description:
  With Ubuntu 18.04

  Ubiquity installer should install mdadm before running grub-install if
  /boot is on a RAID disk.

  There have been multiple bug reports filed over the years against grub-installer.
  The grub-installer is fine.  To support /boot on RAID, mdadm should be pre-installed.

  Various recipes explain to work-around the issue just drop to a shell
  after the installer complains, and chroot to the target, and install
  mdadm, then do grub-install.  Not so easy.

  In my case, I have a ubiquty/success_command that has to run, and the workaround requires
  allowing ubiquity to fail, and so the success_command never happens, nor does any final cleanup.

  The workaround I used was to to hack on the live-CD, which must be done after boot,
  or in my case remains persistent because I made a persistent live-CD using mkusb.

  vi /usr/share/grub-installer/grub-installer
          # near line 647 change from
          apt-install $grub_package || exit_code=$?
          # change to
          # 13.0.6.17.15-t10 jimays Hack to make sure mdadm is installed so grub-install will succeed with RAID.
          apt-install -y mdadm $grub_package || exit_code=$?

  And then ubiquity succeeds and grub installs with /boot on /dev/md1.
  I am not sure where the actual proper place to install mdadm is
  or what the proper test would be to see if it is actually needed.

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