welp, I tried the installation again, this time without creating swap partition at all. Calamares started, ran for a while and… just quit without any error or log. Of course that installation didn’t boot at all, I could not even manually mount the LUKSed drives.
That was when I re-cloned my Tuxedo OS onto the machine. I’m starting to believe that this laptop and Cachy just won’t go together. Which is a pity, because I’m beginning to loathe Ubuntu derivates just for the fact that I can’t regularly get an up-to-date tldr (and no, tldr as flatpak is not an option) 