Public bug reported:
When booting a Bionic system where an MDADM RAID device is degraded
(e.g. 1 of 2 disks appear) and that device is for a non-root filesystem
(e.g. /home) the boot enters emergency mode and the MD device stays
inactive.
This can be reproduced using the live server installation CD, 3 disks -
1 for /, and 2 for a software RAID which is then mounted to /home as
ext4.
After first boot, shutdown the system, remove one of the two RAID disks,
and boot the system.
** Affects: mdadm (Ubuntu)
Importance: High
Status: Confirmed
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https://bugs.launchpad.net/bugs/1825075
Title:
(bionic) boot with degraded RAID array for non-root device enters
emergency mode
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