Comment 12 for bug 668846

Sebastian, I'm reopening this for aptdaemon because I think it should be handled in one place, rather than USC, the Dash, Software Updater, and Software Sources all having to implement it individually.

So, I've designed an alert that should appear to let you know what's going on, with a choice to keep waiting or to cancel the operation. <https://wiki.ubuntu.com/SoftwarePackageOperations?action=diff&rev2=14&rev1=11> Does that all look practical to you?