Well, that's sub-optimal...
Checked my #YuNoHost dashboard for any updates this morning, and there it was - Ghost 6.0.5!
A quick check on disk space (plenty!), then I clicked "Update".
A popup appeared,telling me that I couldn't update to v6 from... 5.0.130 (??), I would have to cast an arcane spell to update to 5.x.140, then upgrade from there.
OK, why couldn't you just do that for me, this is why most people use YuNoHost, but whatever...
I logged in to my console, cast the spell...
"This app does not exist", or words to that effect.
Hmm.
Wait, is that a typo in the spell you want me to cast?
Yeah - "https;//...".
OK, correct that, and...
"Malformed URI, should look like...."
But it does look like that, except with "/tree/" and what looks like a checksum on the end.
OK, stripping out the checksum doesn't work ("Malformed URI"), stripping /tree has the same result.
Okay, let's go to the github page...
Hmm, the only references to 5.x.140 is a changelog, which seems to suggest that the only change was to the version number in a couple of files.
And I had to leave it there, because I had spent 40 minutes troubleshooting this instead of grabbing a shower before leaving for work, and didn't do any of the writing I got up early for.
yawn
There should be a law against early mornings.
So, yeah, still running the last version of Ghost, despite my best efforts.