I think I know what's going on:
Unpacking apport (2.19.1-0ubuntu2) ...
Selecting previously unselected package policykit-1.
Preparing to unpack .../policykit-1_0.105-11ubuntu1_amd64.deb ...
Unpacking policykit-1 (0.105-11ubuntu1) ...
Processing triggers for shared-mime-info (1.3-1) ...
Processing triggers for man-db (2.7.4-1) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for systemd (225-1ubuntu9) ...
Error getting authority: Error initializing authority: Error calling
StartServiceByName for org.freedesktop.PolicyKit1: Timeout was reached
(g-io-error-quark, 24)
The systemd trigger does a "systemctl daemon-reload". But at this point
policykit-1 is merely unpacked, but *not* configured yet. There is a
/etc/dbus-1/system.d/org.freedesktop.PolicyKit1.conf.dpkg-new, which
isn't yet "active", so polkit has no D-Bus policy and can't start.
This does not trigger with only installing policykit-1 as that has no
/etc/init.d/* and thus does not activate systemd's package trigger. So
this happens if you install policykit-1 together with some package which
ships an /etc/init.d/ script.
This will become much simpler once we can ship D-Bus policies in /usr.
However, we need to wait with that until dbus 1.10 is in an LTS, i. e.
we can rely on having "policies in /usr" support for an upgrade;
otherwise we'll break upgrades.
Until then, we need to disallow polkit startup while the package is
unconfigured. This could happen by the preinst doing "ln -s /dev/null
/run/systemd/system/polkitd.service" and the postinst removing that link
again.
** Changed in: policykit-1 (Ubuntu)
Importance: Medium => High
** Changed in: policykit-1 (Ubuntu Vivid)
Importance: Medium => High
** Changed in: policykit-1 (Ubuntu)
Status: Triaged => In Progress
** No longer affects: systemd (Ubuntu Vivid)
** No longer affects: systemd (Ubuntu)
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https://bugs.launchpad.net/bugs/1447654
Title:
installing policykit-1 hangs under systemd
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