Ah, this is probably a one-time thing only, since file
/usr/lib/python3.12/email/errors.py
actually already contains that Python fix on my system:
------------------------- snip -------------------------
[...]
class CharsetError(MessageError):
"""An illegal charset was given."""
class HeaderWriteError(MessageError):
"""Error while writing headers."""
# These are parsing defects which the parser was able to work around.
class MessageDefect(ValueError):
[...]
------------------------- snip -------------------------
Leaving it to you whether you'd like to do something about this issue or not.
For the record, the order of the package upgrades done by unattended-upgrade
during the run where sending mail failed was as follows:
------------------------- snip -------------------------
[...]
Log started: 2024-09-18 10:51:15
(Reading database ... 101329 files and directories currently installed.)
Preparing to unpack .../python3.12-venv_3.12.6-1_amd64.deb ...
Unpacking python3.12-venv (3.12.6-1) over (3.12.4-3) ...
Preparing to unpack .../libpython3.12t64_3.12.6-1_amd64.deb ...
Unpacking libpython3.12t64:amd64 (3.12.6-1) over (3.12.4-3) ...
Preparing to unpack .../libssl3t64_3.3.2-1_amd64.deb ...
Unpacking libssl3t64:amd64 (3.3.2-1) over (3.2.2-1) ...
Selecting previously unselected package openssl-provider-legacy.
Preparing to unpack .../openssl-provider-legacy_3.3.2-1_amd64.deb ...
Unpacking openssl-provider-legacy (3.3.2-1) ...
Setting up libssl3t64:amd64 (3.3.2-1) ...
Setting up openssl-provider-legacy (3.3.2-1) ...
(Reading database ... 101333 files and directories currently installed.)
Preparing to unpack .../python3.12_3.12.6-1_amd64.deb ...
Unpacking python3.12 (3.12.6-1) over (3.12.4-3) ...
Preparing to unpack .../libpython3.12-stdlib_3.12.6-1_amd64.deb ...
Unpacking libpython3.12-stdlib:amd64 (3.12.6-1) over (3.12.4-3) ...
Preparing to unpack .../python3.12-minimal_3.12.6-1_amd64.deb ...
Unpacking python3.12-minimal (3.12.6-1) over (3.12.4-3) ...
Preparing to unpack .../libpython3.12-minimal_3.12.6-1_amd64.deb ...
Unpacking libpython3.12-minimal:amd64 (3.12.6-1) over (3.12.4-3) ...
Preparing to unpack .../openssl_3.3.2-1_amd64.deb ...
Unpacking openssl (3.3.2-1) over (3.2.2-1) ...
Setting up libpython3.12-minimal:amd64 (3.12.6-1) ...
Setting up openssl (3.3.2-1) ...
Installing new version of config file /etc/ssl/openssl.cnf ...
Setting up python3.12-minimal (3.12.6-1) ...
Setting up libpython3.12-stdlib:amd64 (3.12.6-1) ...
Setting up python3.12 (3.12.6-1) ...
Setting up libpython3.12t64:amd64 (3.12.6-1) ...
Setting up python3.12-venv (3.12.6-1) ...
Processing triggers for systemd (256.5-1) ...
Processing triggers for man-db (2.12.1-3) ...
Processing triggers for desktop-file-utils (0.27-2) ...
Processing triggers for libc-bin (2.39-7) ...
Log ended: 2024-09-18 10:51:19
[...]
Log started: 2024-09-18 10:53:14
Preconfiguring packages ...
Preconfiguring packages ...
(Reading database ... 101505 files and directories currently installed.)
Preparing to unpack .../unattended-upgrades_2.11+nmu1_all.deb ...
Unpacking unattended-upgrades (2.11+nmu1) over (2.11) ...
dpkg: warning: unable to delete old directory '/lib/systemd/system-sleep':
Directory not empty
Setting up unattended-upgrades (2.11+nmu1) ...
Processing triggers for man-db (2.12.1-3) ...
Log ended: 2024-09-18 10:53:15
[...]
------------------------- snip -------------------------
