1. add the below line to /etc/apt/sources.list deb http://ftp.us.debian.org/debian testing main contrib non-free

https://wiki.debian.org/AptPreferences

aware to not overwrite steamos packages . Copy the this to the file and save it like before: Package: * Pin: release o=Valve Software LLC Pin-Priority: 900 Package: * Pin: release l=Debian Pin-Priority: 110 06.01.18

https://steamcommunity.com/groups/steamuniverse/discussions/1/648814396114274132/

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