Looking at the linked bug report, the issue was simply caused by having
/var on a separate partition. I tried to do a much more simple scheme
with just / and /var (both ext4) and had no problems. Admittedly that
bug report seems to be specific to BTRFS and it results in a different
error related to trying to unmount something that wasn't mounted. tl;dr
all that has nothing to do with your situation.
I have a sneaking suspicion your problem is somewhat related to your hardware
itself. So the first thing I would try to do is to reproduce the problem with
the exact same setup. Assuming you can do that, I would try to try other
permutations as well as try eliminating variables to see if you can figure out
what the culprit is. I'd suggest:
1. Trying to flip which device has which partition scheme
2. Trying to do the whole partition scheme on one device, then the other
3. Using a simpler partition scheme, perhaps where the other device has only a
/var partition and let /home and /usr just live under /
4. Using the simpler partition scheme on one device or the other
etc.
** Changed in: calamares (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2056647
Title:
Calamares Install fail - Lubuntu Noble 24.04 - Could not unmount
target system
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