Public bug reported:

Binary package hint: partman-auto-loop

Disk images need to be contiguous (as much as possible) with disk space
pre-allocated. The only way to do that in linux I am aware of, is to use
dd if=/dev/zero, but that is slow for large images. Apparently though,
using the default bs=4k, things get quite speedier (thanks to Szabolcs
Szakacsits for the tip).

** Affects: partman-auto-loop (Ubuntu)
     Importance: Undecided
         Status: New

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Use dd with bs=4k when creating disk images
https://bugs.launchpad.net/bugs/144793
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