Comment 4 for bug 273314

libpurple0 can't be installed because of the pidgin-data dependency issue. To resolve this I know pidgin-data needs to be resolved.

Does this part of error message "Depends: pidgin-data (<1:2.5.0-z) but 1:2.5.2-0ubuntu1~hardy1 is to be installed" mean that pidgin-data, version 1:2.5.0-z, remains installed and that it needs to be removed 1st, before it can install the 1:2.5.2-0ubuntu1~hardy1 version can be installed?

If this is the case, then it would appear the installer is truly at fault since it failed to remove the appropriate 1:2.5.0-z file before attempting to upgrade.