Debian, list backports

list

from https://askubuntu.com/questions/313806/how-to-list-available-backport-upgrades

list installed packages that have available backport upgrades

aptitude search '?and(~i, ~Araring-backports)'

list all available backport packages (installed or not)

aptitude search '~Abackports ?not(~S ~i ~Abackports)'

stretch sources.list line

# stretch backports
deb https://deb.debian.org/debian stretch-backports main
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