Comment 40 for bug 541595

Howard Brodale, this seems to be a duplicate bug of these bugs:
Update manager doesn't calculate free space correctly for distribution upgrade
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/986272
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