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

[GerhardGaußling]

this seems to be a duplicate bug of these bugs:
update manager space calculation for a release upgrade was wrong - aftereffect: package ghc 7.4.1-1ubuntu2 failed to install/upgrade: ErrorMessage: dependency problems - leaving unconfigured
https://bugs.launchpad.net/ubuntu/+source/upgrade-system/+bug/996379
[Master] package failed to install/upgrade: package is already installed and configured 
https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/541595

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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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