> > 3. I don't see any locking around the updates of /var/run/motd.new,
so it seems that multiple parallel logins could easily case corruption

> Confirmed, that appears to be a bug. Patches welcome of course. It's
not the highest priority for fixing, given that a corrupted motd isn't
particularly fatal.

Speaking of "patches welcome", I provided a bzr branch for a similar
motd corruption caused by a different script in
https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1146170
seven months ago.   As of today, nobody responded.

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https://bugs.launchpad.net/bugs/684244

Title:
  Multiple issues with pam_motd update-motd code

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