packages with conffile prompts are no longer skipped, leading to upgrade failures

Package: unattended-upgrades
Version: 2.8
Severity: serious

Hi All,

This bug has showing up on this end in unattended-upgrades 2.8 on my
Raspberry Pi Model 3B+ running Raspberry Pi OS 11.2 since January 6, 2022.
I'm emailing this list because the Raspberry Pi OS repos list Michael Vogt <
m...@debian.org> as unattended-upgrade's maintainer for that distro:

# apt show unattended-upgrades
Package: unattended-upgrades
Version: 2.8
Priority: optional
Section: admin
Maintainer: Michael Vogt <m...@debian.org>

Here is proof of the Raspberry Pi OS version:

$ cat /etc/debian_version
11.2

& of the kernel version:

$ uname -a
Linux RaspberryPi3ModelBPlus 5.10.63-v7+ #1496 SMP Wed Dec 1 15:58:11 GMT
2021 armv7l GNU/Linux

Here's the error email I received from root on January 6, 2022:

Unattended upgrade result: All upgrades installed

Packages that attempted to upgrade:
 chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg-extra
 lxplug-updater

Packages with upgradable origin but kept back:
 Raspberry Pi Foundation stable:
  chromium-codecs-ffmpeg-extra chromium-browser lxplug-updater
  chromium-browser-l10n

Unattended-upgrades log:
Enabled logging to syslog via daemon facility
Starting unattended upgrades script
Allowed origins are: origin=Debian,codename=bullseye,label=Debian,
origin=Debian,codename=bullseye,label=Debian-Security,
origin=Debian,codename=bullseye-security,label=Debian-Security, origin=*
Initial blacklist:
Initial whitelist (not strict):
Packages that will be upgraded: chromium-browser chromium-browser-l10n
chromium-codecs-ffmpeg-extra lxplug-updater
Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades
-dpkg.log
Package chromium-browser is kept back because a related package is kept
back or due to local apt_preferences(5).
Package chromium-browser-l10n is kept back because a related package is
kept back or due to local apt_preferences(5).
Package chromium-codecs-ffmpeg-extra is kept back because a related package
is kept back or due to local apt_preferences(5).
Package lxplug-updater is kept back because a related package is kept back
or due to local apt_preferences(5).

& the error email I received today:

Unattended upgrade result: All upgrades installed

Packages that attempted to upgrade:
 chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg-extra
 libraspberrypi-bin libraspberrypi-dev libraspberrypi-doc
 libraspberrypi0 linux-libc-dev lynis raspberrypi-bootloader
 raspberrypi-kernel vcdbg

Packages with upgradable origin but kept back:
 Raspberry Pi Foundation stable:
  chromium-codecs-ffmpeg-extra raspberrypi-bootloader raspberrypi-kernel
  libraspberrypi-doc chromium-browser-l10n libraspberrypi0
  chromium-browser libraspberrypi-dev vcdbg libraspberrypi-bin
 CISOfy stable:
  lynis

Package installation log:
Log started: 2022-01-20  06:45:51
apt-listchanges: Reading changelogs...
apt-listchanges: Reading changelogs...
Preparing to unpack .../linux-libc-dev_1%3a1.20220118-1_armhf.deb ...
Unpacking linux-libc-dev:armhf (1:1.20220118-1) over
(1:1.20211201~buster-1) ...
Setting up linux-libc-dev:armhf (1:1.20220118-1) ...
Log ended: 2022-01-20  06:46:11



Unattended-upgrades log:
Enabled logging to syslog via daemon facility
Starting unattended upgrades script
Allowed origins are: origin=Debian,codename=bullseye,label=Debian,
origin=Debian,codename=bullseye,label=Debian-Security,
origin=Debian,codename=bullseye-security,label=Debian-Security, origin=*
Initial blacklist:
Initial whitelist (not strict):
Packages that will be upgraded: chromium-browser chromium-browser-l10n
chromium-codecs-ffmpeg-extra libraspberrypi-bin libraspberrypi-dev
libraspberrypi-doc libraspberrypi0 linux-libc-dev lynis
raspberrypi-bootloader raspberrypi-kernel vcdbg
Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades
-dpkg.log
Package chromium-browser is kept back because a related package is kept
back or due to local apt_preferences(5).
Package chromium-browser-l10n is kept back because a related package is
kept back or due to local apt_preferences(5).
Package chromium-codecs-ffmpeg-extra is kept back because a related package
is kept back or due to local apt_preferences(5).
Package libraspberrypi-bin is kept back because a related package is kept
back or due to local apt_preferences(5).
Package libraspberrypi-dev is kept back because a related package is kept
back or due to local apt_preferences(5).
Package libraspberrypi-doc is kept back because a related package is kept
back or due to local apt_preferences(5).
Package libraspberrypi0 is kept back because a related package is kept back
or due to local apt_preferences(5).
Package lynis is kept back because a related package is kept back or due to
local apt_preferences(5).
Package raspberrypi-bootloader is kept back because a related package is
kept back or due to local apt_preferences(5).
Package raspberrypi-kernel is kept back because a related package is kept
back or due to local apt_preferences(5).
Package vcdbg is kept back because a related package is kept back or due to
local apt_preferences(5).

Both of these emails have the subject:[package on hold] unattended-upgrades
result for RaspberryPi3ModelBPlus: FAILURE

Interestingly enough, I am not seeing this issue using u-u v2.8 on my
Debian 11.2 amd64 machine.

Any idea how to fix this?

Kindly advise,
Judah

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