Package: tasksel Version: 3.31+deb8u1 Severity: normal If you try to run tasksel on a machine which has removable media configured for apt (such as a freshly installed system via CD-ROM/DVD) it's possible that tasksel will prompt you to insert the media after selecting some tasks If you can't do that for any reason, tasksel does not offer any way to cancel; it loops between two screens with no way out. It also ignores SIGINT and SIGTSTP and locks the apt database, so you can't easily update your sources.list in the background. It would appear you need to issue a SIGTERM from another terminal, adjust your sources.list and try again. This would be a problem in some situations where you can't open a second terminal.