Public bug reported:
Ubuntu 16.04.03 LTS
I customize /lib/systemd/system/apt-daily.timer on my public facing
servers so they only update and reboot once a week, at an earlier time
of day, to reduce downtime during a busy part of our day. The update
this week overwrote the file with no notice or prompting that it was
about to overwrite a customized file. This turned out badly as we had
servers rebooting a couple days later at the worst time of the day.
** Affects: apt (Ubuntu)
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update overwrites customized apt-daily.timer
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