Did some more testing. Perhaps Corey's and my installations don't differ
after all.

On 10.04, changing the "Temporary Files" option to "Delete downloaded
packages after installation" in the Synaptic preferences affects *both*
Synaptic itself and Update Manager. (Verified by changing it to "Leave
all downloaded packages in the cache" and fetching some updates, then
setting it back and fetching more updates.)

On 11.04 (at least), the Synaptic setting only affects packages
installed through Synaptic; Update Manager always leaves the packages in
the cache.

(For completeness, on neither version does the Synaptic setting affect
the behaviour of "sudo apt-get install", which leaves stuff lying around
in the cache regardless.)

Perhaps one might reasonably expect the Synaptic setting to only affect
Synaptic. However, it's a regression in behaviour compared to 10.04, and
it leaves no obvious way for users to stop /var/cache/apt/archives
growing without bounds due to security and other updates (since Update
Manager doesn't have its own preference for this).

Perhaps I can fix this by creating/editing /etc/apt.conf, but I think
there should be an easier way. The 10.04 behaviour seems a fine way of
configuring this to me.

(Leaving the packages lying around is a silly default anyway.
http://brainstorm.ubuntu.com/idea/16215/ reflects this, but the idea of
fixing it seems to have run out of steam.)

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https://bugs.launchpad.net/bugs/674346

Title:
  Packages aren't deleted after installation

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