/usr/bin/unattended-upgrade:apt_pkg.Error:/usr/bin/unattended-upgrade@1917:main:mark_upgrade:mark_install

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades. This problem was most recently seen with package version 1.0ubuntu1, the problem page at https://errors.ubuntu.com/problem/f29b4d5028eeeff1189351721fe408e6bd01fdb5 contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

[Balint Reczey (rbalint)]

This seems to be an apt issue:

Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1917, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1668, in main
    pkg.mark_upgrade(from_user=not pkg.is_auto_installed)
  File "/usr/lib/python3/dist-packages/apt/package.py", line 1316, in mark_upgrade
    self.mark_install(from_user=from_user)
  File "/usr/lib/python3/dist-packages/apt/package.py", line 1309, in mark_install
    fixer.resolve(True)
apt_pkg.Error: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

Unattended-upgrades may catch the exception, but I think it should be fixed in apt.