Public bug reported:

The ubuntu-repository-charm remounts ephemeral storage in a location
more to its liking, and configures it in fstab to mount by label.  Due
to the unique properties of Azure's storage infrastructure, cloud-init
does filesystem setup on every boot.  It seems we just don't reboot our
Azure instances, because only now have we discovered that /usr/sbin
/ephemeral-disk-warning.sh ends up running the following commands the
next time such an instance is booted:

chmod 0444 /srv/ubuntu-repository-cache/ephemeral/0 
/mnt/DATALOSS_WARNING_README.txt
chattr +i /srv/ubuntu-repository-cache/ephemeral/0 
/mnt/DATALOSS_WARNING_README.txt

which as you can imagine really ruins ubuntu-repository-cache's day.
u-r-c should most likely be updated to disable ephmemeral-disk-warning
as instructed, but it would also be best if ephemeral-disk-warning.sh
dealt more gracefully with this situation.

** Affects: walinuxagent (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1626318

Title:
  ephemeral-disk-warning.service trips over multiply-mounted filesystems

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