This bug was fixed in the package ghc6 - 6.12.3-1ubuntu7
---
ghc6 (6.12.3-1ubuntu7) natty; urgency=low
* d/rules: Install /usr/share/haddock-$VERSION in ghc6-haddock package;
these files which are required by haddock. (LP: #749963)
* d/control:
+ Add Replaces on ghc6-doc
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https://bugs.launchpad.net/bugs/749963
Title:
package ghc6-doc 6.12.3-1ubuntu6 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 1
