@Tianon,

You are correct that a user then would inevitably get an out of date
package.

However, removing the release pocket content
a.) means every user in every image has to download that data which does not 
change.
b.) only defers the potential problem until later.

Essentially, the problem is that in order to *ever* run:
  apt-get install package
you have to have run recently run "apt-get update" for some value of recently.

default cloud images (I believe) end up running apt-get update within 24 hours 
and
then do so on a daily-ish basis, which probably suffices as a definition of
"recently".

I think the ideal solution is to have 'apt-get install' (or 'apt install') to
run an update by default if it detects that sources are out of date or modified.

Related bug wit some other info and discussion at bug 1429285 .

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https://bugs.launchpad.net/bugs/1699913

Title:
  /var/lib/apt/lists has content in partner-images/Docker tarballs,
  which becomes stale quickly

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