Comment 13 for bug 1824804

Xenial was not affected by this bug due to the fix of LP: #1821101 was not released to Xenial.

The fix for LP: #1821101 however will be released including the fix for the regression for this bug thus the verification of this regression fix is needed.

Verified 1.1ubuntu1.18.04.7~16.04.3 on Xenial:

Original version:
root@x-lp-1824804:~# dpkg -l unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===================-==========================-============-===========================================
ii unattended-upgrades 1.1ubuntu1.18.04.7~16.04.2 all automatic installation of security upgrades
root@x-lp-1824804:~# unattended-upgrade --verbose --debug
Initial blacklisted packages:
Initial whitelisted packages:
Starting unattended upgrades script
Allowed origins are: o=Ubuntu,a=xenial, o=Ubuntu,a=xenial-security, o=UbuntuESM,a=xenial
...
Checking: libpam-systemd ([<Origin component:'main' archive:'xenial-updates' origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>, <Origin component:'main' archive:'xenial-security' origin:'Ubuntu' label:'Ubuntu' site:'security.ubuntu.com' isTrusted:True>])
package libpam-systemd upgradable but fails to be marked for upgrade (E:Unable to correct problems, you have held broken packages.)
Checking: libsystemd0 ([<Origin component:'main' archive:'xenial-updates' origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>, <Origin component:'main' archive:'xenial-security' origin:'Ubuntu' label:'Ubuntu' site:'security.ubuntu.com' isTrusted:True>])
package libsystemd0 upgradable but fails to be marked for upgrade (E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.)
Checking: systemd ([<Origin component:'main' archive:'xenial-updates' origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>, <Origin component:'main' archive:'xenial-security' origin:'Ubuntu' label:'Ubuntu' site:'security.ubuntu.com' isTrusted:True>])
pkg systemd is on hold
sanity check failed
pkgs that look like they should be upgraded:
Fetched 0 B in 0s (0 B/s)
fetch.run() result: 0
blacklist: []

Fixed version:
root@x-lp-1824804:~# dpkg -l unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===================-==========================-============-===========================================
ii unattended-upgrades 1.1ubuntu1.18.04.7~16.04.3 all automatic installation of security upgrades
root@x-lp-1824804:~# unattended-upgrade --verbose --debug
Initial blacklisted packages:
Initial whitelisted packages:
Starting unattended upgrades script
Allowed origins are: o=Ubuntu,a=xenial, o=Ubuntu,a=xenial-security, o=UbuntuESM,a=xenial
...
Checking: libpam-systemd ([<Origin component:'main' archive:'xenial-updates' origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>, <Origin component:'main' archive:'xenial-security' origin:'Ubuntu' label:'Ubuntu' site:'security.ubuntu.com' isTrusted:True>])
package libpam-systemd upgradable but fails to be marked for upgrade (E:Unable to correct problems, you have held broken packages.)
falling back to adjusting libpam-systemd's dependencies recursively
adjusting candidate version: libaudit1=1:2.4.5-1ubuntu2
adjusting candidate version: init-system-helpers=1.29ubuntu1
adjusting candidate version: libpam-modules=1.1.8-3.2ubuntu2
...