Bug#764926: (no subject)

[Hashem Nasarat]

I came across this bug today and spent a little time trying to figure 
out what's wrong.

I booted with Solution1 on https://wiki.debian.org/systemd#Debugging to 
enable logging.

On the plymouth screen if I press a key

[OK] Started Bluetooth service.
[OK] Reached target Bluetooth.
[16] systemd[1]: Received SIGRTMIN+20 from PID 170 (plymouthd).
(a long time passes)
[908] systemd[1]: Starting Cleanup of Temporary Directories...
[908] systemd[1]: Started Cleanup of Temporary Directories.

Nothing was happening so I rebooted again and immediately switched to 
TTY1 (if that's what it is, Ctrl + Alt + F1), I see systemd debug 
messages interspersed with the standard "[OK] Started Foo" messages. 
The missing systemd-vconsole-setup.service seems very peculiar (though 
this issue might not actually be related).

Begin: Running /scripts/init-premount ... _

systemd[1]: Cannot add dependency job for unit 
systemd-vconsole-setup.service, ignoring: Unit 
systemd-vconsole-setup.service failed to load: No such file or 
directory.
systemd[1]: startup finished in 10.500s...
systemd[1]: Cannot add dependency job for unit 
systemd-vconsole-setup.service, ignoring: Unit 
systemd-vconsole-setup.service failed to load: No such file or 
directory.


The code that implements the update & restart functionality in 
gnome-software is:
https://git.gnome.org/browse/gnome-software/tree/src/gs-shell-updates.c?id=579cd816642320775757ee90ef3670c7a57605af#n860

which winds up at:
https://github.com/hughsie/PackageKit/blob/ffc06ea98abd74acfa5696d017058015d26acf68/src/pk-engine.c#L1510

which is what symlinks /system-update (afterwards, back in 
gnome-software, there's a call to gs_reboot), under a comment "create 
symlink for the systemd-system-update-generator"
http://freedesktop.org/wiki/Software/systemd/SystemUpdates/

At this point, I am not familiar enough with systemd to [quickly] debug 
why, but it SEEMs like the problem is with systemd, and not 
gnome-software/PackageKit. (I'll be learning more unless someone chimes 
in with a fix/some tips.)
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