ah, very good ! so Horizon does allow this and we're not restricted to a fixed partition scheme built on an empty/emptied disk space, great news (the opposite would be a tad disappointing TBH). And thanxx again for posting a while ago a kind of tutorial on how to do this.If you allocate the partitions manually usingmac-fdisk
(and make the filesystems), you'll be able to use them in Horizon with the middle option "Manually select partitions".
Now I still have plenty to discover, to begin with having a functional network connection, which Adélie does not trigger automatically at install if I understand correctly. But again I think I'd rather start a separate thread aimed specifically at my machine (and lack of expertise :?).