This bug was fixed in the package ubiquity - 2.21.10
--------------- ubiquity (2.21.10) vivid; urgency=medium
* debian/ubiquity.install-any: Adjust for dropped 94extras in apt-setup -- Adam Conrad <email address hidden> Tue, 17 Feb 2015 18:42:54 -0700
This bug was fixed in the package ubiquity - 2.21.10
---------------
ubiquity (2.21.10) vivid; urgency=medium
* debian/ ubiquity. install- any: Adjust for dropped 94extras in apt-setup
-- Adam Conrad <email address hidden> Tue, 17 Feb 2015 18:42:54 -0700