Comment 3 for bug 64309

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Martin-Éric Racine (q-funk) wrote :

And sure enough, update-manager's help shows:

update-manager --help
usage: update-manager [options]

options:
  -h, --help show this help message and exit
  -c, --check-dist-upgrades
                        Check if a new distribution release is available
  -d, --devel-release Check if upgrading to the latest devel release is
                        possible
  --dist-upgrade, --dist-ugprade
                        Try to run a dist-upgrade

...which is exactly what you were using. :)