My system was busy with a very large 'rsync' backup process on an
external drive and there was no possibility to 'aptitude safe-upgrade'
anything (hanging at unpacking). I killed the 'rsync' process and the
'aptitude safe-upgrade' ran smoothly.

I tested around a bit and noticed that it is really the 'rsync' process
that causes the hanging, and not the fact that the external drive is
plugged in. As soon as I kill this process, any 'aptitude install'
process will immediately finish smoothly even if it was previously
hanging.

My 'dpkg' version is 1.15.5.6ubuntu2 (amd64) on Ubuntu 10.04 LTS.

As suggested by Theodore Ts'o, I upgraded to version 1.15.8.10 and this
was enough to get rid of this bug (had to install 'xz-utils' for
dependency issues).

I suggest to change the Ubuntu 10.04 LTS 'dpkg' version to 1.15.8.7 or
above as this is the "Long Term Support" version, and a lot of people
will be using it and expecting it to work 'out of the box'.

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https://bugs.launchpad.net/bugs/624877

Title:
  INFO: task dpkg:23317 blocked for more than 120 seconds.

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