FYI, the reason I did not include the apt package index in the original
Ubuntu AMIs on EC2 was because:

- it increased the size of the AMI by 40%,

- there is a strong correlation between the AMI size and load time
(pending to running), and

- users should almost always "apt-get update" before upgrading or
installing packages.

On my Hardy ami-c4f615ad, disk usage goes from 393 MB to 553 MB with
"apt-get update" (increase of 160 MB or 41%).

On the Karmic ami-1515f67c, disk usage goes from 548 MB to 576 MB with
"apt-get update (increase of 28 MB or 5%) so it is not as big of a deal.

On the other hand, perhaps this is an indication of extra files left on the new 
Karmic images which might not be needed and which could be removed to speed up 
their startup time on EC2.  Here's a couple sets of files for consideration 
with sizes on a fresh Karmic instance:
  13M   /var/cache/apt/pkgcache.bin
  34M   /var/lib/apt/lists

-- 
ec2/uec images should have complete apt package lists
https://bugs.launchpad.net/bugs/513060
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