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
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