Comment 8 for bug 1171931

If it isn't apt's job, then I suggest that it's aptdaemon's, not USC's. You should get the same error whether you try to install the package from USC, from the Dash, or (if it ends up in a PPA or third-party archive somehow) from Software Updater.

If so, reassign to me and I'll spec the error presentation in <https://wiki.ubuntu.com/SoftwarePackageOperations#installing-or-updating>.