We can close this bug report at this point.  But I do appreciate the
follow up!

It turns out that there were two problems.  The first was that 18.04 had
misconfigured the cryptoswap so that was not working at all.  I reported
this separately before the release of bionic and I believe that this bug
has been fixed by the maintainers.  The second was that the kernel was
running out of inotify watches and this prevented (for some reason) gdm3
from allowing logins to complete.   The inotify watches were being
consumed by the Crashplan java app.  I increased the
fs.inotify.max_user_watches  to 1048576 and that solved the problem.  I
realize that this consumes some unswappable ram, but I rather have
Crashplan than not.

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  Greeter/lockscreen fails to authenicate in an endless loop. Repeated
  "No space left on device" errors and strange swap file configuration

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