I found the bug. It is with this line
[ -z "$errors" ] || exit 3
debian package maintainer scripts do not have their environment
sanitized. So if the (root) user has a variable "errors" set in their
environment (for whatever reason, maybe even apt set it) the postinst
will error.
100% reproduction usecase
sudo errors=hi apt install --reinstall python3
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 7 not upgraded.
Need to get 23.0 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu noble-updates/main amd64 python3
amd64 3.12.3-0ubuntu2 [23.0 kB]
Fetched 23.0 kB in 0s (56.4 kB/s)
(Reading database ... 601985 files and directories currently installed.)
Preparing to unpack .../python3_3.12.3-0ubuntu2_amd64.deb ...
running python pre-rtupdate hooks for python3.12...
dpkg: error processing archive
/var/cache/apt/archives/python3_3.12.3-0ubuntu2_amd64.deb (--unpack):
new python3 package pre-installation script subprocess returned error exit
status 3
Errors were encountered while processing:
/var/cache/apt/archives/python3_3.12.3-0ubuntu2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
** Changed in: python3-defaults (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/2078356
Title:
python3 preinst failure to run pre-rtupdate hooks
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