you need to ppa-purge all extra ppa's, and then try again
or just run 'sudo apt update && apt upgrade' after enabling -proposed, that should work on top of my ppa (but not padoka's, since it has 17.3)
you need to ppa-purge all extra ppa's, and then try again
or just run 'sudo apt update && apt upgrade' after enabling -proposed, that should work on top of my ppa (but not padoka's, since it has 17.3)