There is no indication of progress or that its waiting when clicking on "install" in the appdetailsview while another app is already installing. The UI will just show a progressbar but nothing more. We should probably add some text in the progress "waiting for task to finish" ideally from a existing string or via dgettext from aptdaemon
<https://wiki.ubuntu.com/SoftwareCenter#software-item-screen-state-installed>: "If the item is being installed or removed, or is queued for installation or removal (but not if its add-ons are being changed), the status text for the installation at the leading end, and a progress bar at the trailing end."
<https://wiki.ubuntu.com/SoftwareCenter#installing>: "If the item is queued waiting for another package manager to close, the status text for the item should be “Waiting for {Application Name} to exit”. If the item is queued waiting for any other activity to complete, the status text for the item should be “Waiting”."
It may save time to fix bug 954652 at the same time as this bug.
This is the result of user-testing we did this week.