Comment 5 for bug 1509717

As a workaround, you can add the relevant modules to the initramfs. A quick walkthrough is as follows:

- Boot from the install media, and choose "Rescue a broken system."
- Run through all of the basic configuration steps, configuring location, keyboard, networking, timezone, etc.
- When prompted for root filesystem, select your usual root volume (eg, /dev/my-vg/root)
- Also mount a separate /boot partition
- Execute a shell in /dev/my-vg/root
- Type "mount" and ensure that the correct / and /boot volumes are actually mounted.
- Add the raid1 and mirror modules to /etc/initramfs-tools/modules, and rebuild the initramfs
# echo raid1 >> /etc/initramfs-tools/modules
# echo dm_mirror >> /etc/initramfs-tools/modules
# update-initramfs -u
- Exit out of the shell, and reboot the system. Don't forget to remove the install media!