Comment 0 for bug 1922997

Tested manually, this node can boot with 4.15.0-140-generic

However with 4.15.0-141.145~16.04.1 in proposed, it will drop into initramfs:

[ 12.593593] raid10: disagrees about version of symbol module_layout
done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... [ 12.963251] raid6_pq: disagrees about version of symbol module_layout
done.
Begin: Waiting for root file system ... Begin: Running /scripts/local-block ... mdadm: CREATE group disk not found
mdadm: No devices listed in conf file were found.
done.
Begin: Running /scripts/local-block ... mdadm: CREATE group disk not found
mdadm: No devices listed in conf file were found.
done.
(this mdadm message repeats)
Gave up waiting for root device. Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (did the system wait long enough?)
   - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT! UUID=348b5e78-915d-47b0-93db-3eca0d8f048e does not exist. Dropping to a shell!
[ 204.831089] hid: disagrees about version of symbol module_layout

BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1.4) built-in shell (ash)
Enter 'help' for a list of built-in commands.

(initramfs)

Please find attachment for the boot log.