>> lightDM login will never show. Looking at any of the consoles 1 to 6 you may
>> log in, looking at the network various devices are not configured.
>> Plymouth seems not to be active any more, lightDM occupies tty7.
>
> Does this mean that, by checking VT1-6, the problem with VT7 is
> cleared and lightdm is allowed to start? Or is plymouth actually
> running on a different VT than VT7?

Plymouth runs on vt7. lightdm is started to run on vt7 also. It just
sits there waiting for vt7 to become availabe, but after plymouth is
terminated (by "plymouth --quit") it doesn't recognize it is terminated
--- maybe this is related to plymouth using /var/run and lightdm using
/run?

> Does the problem ever clear itself automatically if you just wait?

After some time (more than 4h) no. Plymouth is running at the moment.
The laptop was started about 15:00.  Its 21:00 now. In the background
lightdm was waiting. It has terminated meanwhile ...

> "Booting system without full network configuration" means that you have
> interfaces configured statically in > /etc/network/interfaces that are
> unavailable. If these interfaces are not normally available, you can remove
> this boot-time delay by either marking the interfaces as no longer being
> "auto", or by letting network-manager manage them instead of ifupdown.

As stated: the network devices are available. They are created: three bridges, 
ethernet, local loopback, and wlan. The bridges where funktional without any 
manual interaction before upgrading. Now only the first brige is started. The 
other two are ignored. There where no changes to the config file.
The bridges are assumed to be up at system startup. Maybe this is again related 
to parts of the networking setup using /var/run/network, while others use 
/run/network.

>> /lib/plymouth/themes/tps-ubuntu/tps-ubuntu.plymouth
>
> Is this problem reproducible with the standard Ubuntu plymouth theme?

Yes. This theme is the standard theme, but with slight design changes:
the background image is different, and the "Ubuntu"-Logo was moved to a
better suiting place (to not disrupt the fine mountain view I am using
for the background).

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https://bugs.launchpad.net/bugs/876449

Title:
  plymouth hanging after printing "Booting system without full network
  configuration"

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