I agree, the stage 2 fix for this issue concerns me with regard to
regressing current use cases.

As much as I'd like to get rid of the rest of this issue (any user of
10.0.4.0/24 behind a router looses connectivity to that subnet), we must
make sure we do not regress anyone who's been relying on "apt-get
install lxc" providing something that can immediately be used both by
root and for unprivileged users.

Serge: We may be able to provide a hook, added to
/usr/share/lxc/config/common.conf.d which will bring the bridge up
automatically at first lxc container start. Such a hook would
unfortunately need to be setuid so that it also works for unprivileged
users. We'd also need to make sure that the current lxc hooks are
sufficient from a timing point of view to do so (run before lxc checks
whether the requested bridge exists).

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https://bugs.launchpad.net/bugs/1509414

Title:
  pre-installed lxc in cloud image produces broken lxc (and later lxd)
  containers

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