Ubuntu 20 Focal errors on passwd configuration

[williamgarrison]

Sorry in advance, this is my first time ever asking for help/bugfix on a project like this...

My host is running debian 11, and the ganeti cluster (installed via apt, version 3) works fine for creating debian 11 and ubuntu 18 VMs, but trying to create a "focal" VM yields the following error: (pulled from debootstrap.log on the instance disk)

Setting up passwd (1:4.8.1-1ubuntu5) ...
Killed
Killed
chown: cannot access '/etc/shadow': No such file or directory
chmod: cannot access '/etc/shadow': No such file or directory
Please correct the error and rerun `/sbin/shadowconfig on'
dpkg: error processing package passwd (--configure):
 installed passwd package post-installation script subprocess returned error exit status 1
Setting up libpam-runtime (1.3.1-5ubuntu4) ...
Setting up login (1:4.8.1-1ubuntu5) ...
Setting up util-linux (2.34-0.1ubuntu9) ...
update-alternatives: using /bin/more to provide /usr/bin/pager (pager) in auto mode
Setting up mount (2.34-0.1ubuntu9) ...
Setting up sysvinit-utils (2.96-2.1ubuntu1) ...
Processing triggers for libc-bin (2.31-0ubuntu9) ...
Errors were encountered while processing:
 passwd

In case it's helpful, here's the contents of my /etc/ganeti/instance-debootstrap/variants/focal.conf: (but I've also tried it with no extra packages, to no avail - same result)

ARCH="amd64"
SUITE="focal"
EXTRA_PKGS="grub2-common,grub-pc,linux-image-virtual"
MIRROR="http://archive.ubuntu.com/ubuntu/"
COMPONENTS="main,universe"

[williamgarrison]

Because I was curious, the bionic and focal scripts in /usr/share/debootstrap/scripts are identical (I used diff to compare). Not sure if this is a problem/intentional or not.

[williamgarrison]

Sending an email to submit@bugs.debian.org as well, since I don't know if this is a ganeti or a debootstrap problem (or both).