we're getting closer, this is a part of the scheduled one this morning:
2026-02-06 06:09:31,611 WARNING Could not figure out development release: Distribution data outdated. Please check for an update for distro-info-data. See /usr/share/doc/distro-info-data/README.Debian for details.
2026-02-06 06:09:31,612 INFO Starting unattended upgrades script
2026-02-06 06:09:31,612 INFO Allowed origins are: o=Ubuntu,a=jammy, o=Ubuntu,a=jammy-security, o=UbuntuESMApps,a=jammy-apps-security, o=UbuntuESM,a=jammy-infra-security
2026-02-06 06:09:31,613 INFO Initial blacklist:
2026-02-06 06:09:31,613 INFO Initial whitelist (not strict):
2026-02-06 06:09:46,207 INFO Packages that will be upgraded: libc-bin libc-dev-bin libc6 libc6-dev libssl3 linux-generic linux-headers-generic linux-image-generic linux-libc-dev locales mysql-client-8.0 mysql-client-core-8.0 mysql-server-8.0 mysql-server-core-8.0 openssl screen
2026-02-06 06:09:46,208 INFO Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
2026-02-06 06:09:48,505 ERROR Installing the upgrades failed!
2026-02-06 06:09:48,505 ERROR error message: installArchives() failed
2026-02-06 06:09:48,506 ERROR dpkg returned a error! See /var/log/unattended-upgrades/unattended-upgrades-dpkg.log for details
2026-02-06 06:09:48,952 INFO Package libc-bin is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:48,954 INFO Package libc-dev-bin is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:48,956 INFO Package libc6 is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:48,957 INFO Package libc6-dev is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,016 INFO Package libssl3 is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,037 INFO Package linux-generic is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,044 INFO Package linux-headers-generic is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,051 INFO Package linux-image-generic is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,058 INFO Package linux-libc-dev is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,165 INFO Package locales is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,172 INFO Package mysql-client-8.0 is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,174 INFO Package mysql-client-core-8.0 is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,175 INFO Package mysql-server-8.0 is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,177 INFO Package mysql-server-core-8.0 is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,189 INFO Package openssl is kept back because a related package is kept back or due to local apt_preferences(5).
2026-02-06 06:09:49,224 INFO Package screen is kept back because a related package is kept back or due to local apt_preferences(5).
The mentioned /var/log/unattended-upgrades/unattended-upgrades-dpkg.log:
Log started: 2026-02-06 06:09:46
Preconfiguring packages ...
Preconfiguring packages ...
dpkg: unrecoverable fatal error, aborting:
unknown system group 'netdata' in statoverride file; the system group got removed
before the override, which is most probably a packaging bug, to recover you
can remove the override manually with dpkg-statoverride
E:Sub-process /usr/bin/dpkg returned an error code (2)
Log ended: 2026-02-06 06:09:47
This is a left over of a "total" removing (2 weeks ago) of netdata installation years ago (now we have graphs in Cloudron 9 we don't need it anymore), I did:
sudo dpkg-statoverride --list | grep netdata
root netdata 755 /usr/share/netdata/www
root netdata 755 /var/lib/netdata/www
~# sudo dpkg-statoverride --remove /usr/share/netdata/www
~# sudo dpkg-statoverride --remove /var/lib/netdata/www
~# sudo dpkg-statoverride --list | grep netdata
I'll check tomorrow if the nightly unattended upgrade did work. Thanks @James for pointing the right direction!