Degraded software RAID boot problems

[Gareth Evans]

NB. This replaces bug report #1466803 which is inaccurate.

The Setup:
VirtualBox 2 x 8GB disks
Software RAID 1 or 10:
md0 = 1GB /boot bootable
md1 = 7GB LVM (1GB swap, 6GB root) - encrypted for (1) below so the initial setup looks like...

for test 1: Software RAID > encrypted volume > LVM
for test 2: Software RAID > LVM

The issues (tested on VirtualBox with and on 14.04.2):

1. Boot of encrypted LVM RAID system hangs when disk is removed.
Last boot messages are:
Reading all physical volumes. This may take a while...
No volume groups found
No volume groups found
Begin: waiting for encrypted source device... ...

2. Boot of UNencrypted LVM RAID system hangs when disk is removed and replaced.
Last boot messages are repeated:
Incrementally starting RAID arrays...
mdadm: CREATE user root not found
mdadm: CREATE group disk not found
Incrementally started RAID arrays.

[Gareth Evans (garethevans-9)]

For a workaround please see http://forums.linuxvoice.com/viewtopic.php?f=4&t=531#p2403

[Chris Guiver (guiverc)]

Thank you for reporting this bug to Ubuntu.

Ubuntu 14.04 (trusty) reached end-of-life on April 25, 2019.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.

[Launchpad Janitor (janitor)]

[Expired for mdadm (Ubuntu) because there has been no activity for 60 days.]