[Bug 1926972] [NEW] Xubuntu with LUKS FDE hangs upon boot after Hirsute upgrade

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After upgrading to Hirsute, I'm unable to boot my Xubuntu laptop with
LUKS FDE. It was working fine on Groovy, and I have made no changes
besides upgrading.

The system now hangs on boot. Nothing is displayed (completely black
screen, no passphrase prompt,  no cursor, nothing), and the keyboard
does not respond (not even Caps Lock). This does not appear to be the
reported known Xubuntu issue about having to press ESC (once or twice)
to see the password prompt; as mentioned, the keyboard does not appear
to respond at all. I have also confirmed that this is not #1915579, as
the installed lvm2 version includes the fix, and I have manually
confirmed that /usr/share/initramfs-tools/hooks/lvm2 is 755.

/etc/crypttab looks fine as far as I can tell, and nothing complained
during upgrade. I have tried doing dpkg-reconfigure (and apt-get install
--reinstall) against grub-pc, initramfs-tools, cryptsetup and the latest
installed kernel, to no avail. No complaints from any of that either.

~ # cat /etc/crypttab 
sda4_crypt UUID=<my-uuid-is-listed-here> none luks,discard

All package versions are current as of writing (including hirsute,
hirsute-updates, hirsute-security). The volume mounts fine when booting
from installation media.

Not sure which package to report this against, as I don't know where the
problem is located.

HW in case it matters (though I doubt it) is a Lenovo ThinkPad X220
running latest BIOS (1.46), with Samsung 860 EVO S-ATA. BIOS is
configured with "Legacy first", rather than UEFI.

Any help greatly appreciated.

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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Xubuntu with LUKS FDE hangs upon boot after Hirsute upgrade
https://bugs.launchpad.net/bugs/1926972
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