[Bug 986272] Re: Update manager doesn't calculate free space correctly for distribution upgrade

[bcbc]

Bug 541595 is marked as 'fix released'. So it's no longer active. Also,
that bug was to do with an incorrect report that a package was already
installed.  The other bug 996379 is marked as invalid.

This bug is to do with update-manager checking the space required for
the release-upgrade incorrectly. Then proceeding with the upgrade only
to fail due to lack of free space.

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https://bugs.launchpad.net/bugs/986272

Title:
  Update manager doesn't calculate free space correctly for distribution
  upgrade

Status in “update-manager” package in Ubuntu:
  Confirmed

Bug description:
  I ran an upgrade from 11.10 to 12.04 with 1.9GB free space. No warning
  was given about insufficient free space. I received two popup windows
  during the upgrade informing me that I was low on space and this went
  down to less than 100MB (as I manually freed up space).

  The problem may be:
  1. ~1800 packages are downloaded (this could be the amount of free space it thinks it needs
  2. After upgrading and removing old packages it uses a net amount of ~500MB (this could be the free space it thinks)
  3. During unpacking and installing 1800 packages it uses 2GB+ <== this is definitely not the amount of space it thinks it needs.

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