Comment 4 for bug 464969

I've now specified an action bar for the "Progress" section, which would let you cancel all tasks that are safe to cancel. <https://wiki.ubuntu.com/SoftwareCenter#cancel-bar> Anyone is welcome to implement it.

Meanwhile, thanks for the report, but I'm marking this Invalid for five reasons. First, it has always been possible to close USC, so "cannot close software center" is not accurate. Second, USC is not the process that installs or removes software, whether it is open or closed, so "the process is running" is not accurate. Third, USC is not the only way to install or remove software, so "no locked files (APT)" is not something USC could ever reasonably achieve. Fourth, showing a confirmation alert is a clue that the design is mistaken, so we shouldn't change the design such that one would be necessary. And fifth, while it is not currently possible to pause tasks, it is possible to cancel them even after USC has closed, by reopening it and going to the "Progress" section.