Linux Debian Mint Ubuntu How To Add Non-Free Repositories and Contrib
You just add on "non-free" at the end of each repo, like the example below:
If you wanted contributed packages then you could also add "non-free contrib" to each repo line.
Don't forget to do an "apt update" to see the new packages, this is especially handy for getting more drivers for devices with the firmware-linux-nonfree package.
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linux, debian, mint, ubuntu, repositories, contribyou, quot, repo, contributed, packages, contrib, apt, update, drivers, devices, firmware, nonfree,