There’s no quicksetup for Slackware at this time (if anyone who uses Slackware wants to contribute them, that would be awesome 
), but there are these instructions here: SlackBuilds.org - flatpak
There’s no quicksetup for Slackware at this time (if anyone who uses Slackware wants to contribute them, that would be awesome ), but there are these instructions here: SlackBuilds.org - flatpak