John, thanks a lot for your report! Definitely we don't want to delay boots - 
although I'm happy to hear that eventually it boots. Can you send me logs so I 
can understand what's going on?
My suggestion is to follow the steps below (as root user):

(0) [optional] Force a log rotation, in order we only capture the 
relevant/latest data:
logrotate -f /etc/logrotate.conf ;

(1) Add "debug ignore_loglevel" to your kernel command-line (usually
done by editing /etc/default/grub or /etc/default/grub.d/[somefile]);
update grub after editing the conf file (through "update-grub" tool);

(2) Now that'll seem a bit counter-intuitive: reboot the machine, and
all initramfs-tools verbose output will go to a file, *including* the
password requests for LUKS (I'm not sure why this happens, I feel it's
bug but we can live with that for now, to collect your data). So your
system might seem hung - write the password and press ENTER how many
times it's usually asked (when system appears hung) - hopefully you
manage to boot your system, even if takes a while.

(3) Collect 2 files and attach them here please: "/var/log/syslog" and
"/run/initramfs/initramfs.debug".

Hopefully with that I can understand exactly what's causing this weird behavior 
in your setup.
Cheers,


Guilherme

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https://bugs.launchpad.net/bugs/1879980

Title:
  Fail to boot with LUKS on top of RAID1 if the array is broken/degraded

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