[Bug 1547983] [NEW] Cache isn't always used

[Sworddragon]

Public bug reported:

I'm using Ubuntu 16.04 dev with apt 1.2.3 and I'm noticing that using
"apt-get download" does not always use the cache like this example
shows:

root at ubuntu:~/tmp# apt-get install adwaita-icon-theme-full --reinstall
Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 8089 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu xenial/universe amd64 adwaita-icon-theme-full all 3.18.0-2ubuntu3 [8089 kB]
60% [1 adwaita-icon-theme-full 6033 kB/8089 kB 75%]                                                                                                                                                                              422 kB/s 4s^C
root at ubuntu:~/tmp# apt-get download adwaita-icon-theme-full
Get:1 http://archive.ubuntu.com/ubuntu xenial/universe amd64 adwaita-icon-theme-full all 3.18.0-2ubuntu3 [8089 kB]
12% [1 adwaita-icon-theme-full 1231 kB/8089 kB 15%]^C

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

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https://bugs.launchpad.net/bugs/1547983

Title:
  Cache isn't always used

Status in apt package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 16.04 dev with apt 1.2.3 and I'm noticing that using
  "apt-get download" does not always use the cache like this example
  shows:

  root at ubuntu:~/tmp# apt-get install adwaita-icon-theme-full --reinstall
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
  Need to get 8089 kB of archives.
  After this operation, 0 B of additional disk space will be used.
  Get:1 http://archive.ubuntu.com/ubuntu xenial/universe amd64 adwaita-icon-theme-full all 3.18.0-2ubuntu3 [8089 kB]
  60% [1 adwaita-icon-theme-full 6033 kB/8089 kB 75%]                                                                                                                                                                              422 kB/s 4s^C
  root at ubuntu:~/tmp# apt-get download adwaita-icon-theme-full
  Get:1 http://archive.ubuntu.com/ubuntu xenial/universe amd64 adwaita-icon-theme-full all 3.18.0-2ubuntu3 [8089 kB]
  12% [1 adwaita-icon-theme-full 1231 kB/8089 kB 15%]^C

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