Public bug reported:
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.
** Affects: grub-installer (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1852041
Title:
ubiquity grub-install fails with /boot on RAID, ubiquity does not
install mdadm
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