If you failed at download one package in “apt-get install” commands. it’ll keep downloading it if you run “apt-get install” next time. it is really annoying.
you should kill the downloading process by check string related in the following dir or files:
“/usr/share/package-data-downloads/”
“/var/lib/update-notifier/package-data-downloads/”
“/usr/share/update-notifier/package-data-downloads-failed”
“/var/lib/update-notifier/user.d/data-downloads-failed”
“/usr/share/update-notifier/package-data-downloads-failed-permanently”
“/var/lib/update-notifier/user.d/data-downloads-failed-permanently”
and deleted the string or file related.