Restoring config files from debs is not straightforward. We won't now
know what removed it, but, for example, if a mistake happened and for
some reason "rm -f /etc/ipsec.conf" was run, special flags have to be
given to dpkg to restore a missing config.
Since you restored it already, there is nothi
If installing the package doesn't restore ipsec.conf, then it's because
it was removed outside the package's control, usually.
Could you check /var/log/apt/history.log to backtrack the packages you
installed and upgrade to see if there is a clear way to reproduce this
problem?
That being said, t
