OK, answering my own question it appears this was just a case of the install media not fully working.
> On 25 Jan 2022, at 17:43, Dan Whitehouse <d...@dim-sum.org> wrote: > > Hi, I’m having trouble installing Sid on my G5. > The issue is documented in this YouTube video: > https://www.youtube.com/watch?v=g-Ugfqj1ank > <https://www.youtube.com/watch?v=g-Ugfqj1ank> > > And it appears to be related to hfsprogs. > If anyone can offer advice or a more Debian centric workaround I’d be > grateful. > > Thanks, > > Dan
