Softwar Center reports failure after successfully installing purchased package

[Bernie Innocenti]

This is software-center_5.2.6.

After installing a purchased Humble Bundle game, the installer reports this error:

Package operation failed
The installation or removal of a software package failed.

Details:
installArchives() failed: (Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 322466 files and directories currently installed.)
Unpacking dustforce (from .../dustforce_1.0-0ubuntu1_amd64.deb) ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Setting up dustforce (1.0-0ubuntu1) ...
Error in function:

The text ends like this, without reporting any specific error.