It doesn't work on all hardware, do not ask why, I am lucky user, GNOME work on old AMD hardware from 2008.
4 GB RAM, first install failed, second work.
So do not use any software other than calamares.
I make first screenshot, open terminal, open file browser, use neofetch.
First install, I move away from PC, show not "All done". Calamares was closed.
Second install, without using apps, work fine. All done window, reboot, work.
Magic or just Linux?
My nice old grey-blue eyes don't saw this value .
Point me, but unused RAM is always wasted RAM
Ahh, maybe I open Firefox, then we know why it is a little more
I point to System space (partition)
So you had pretty much the same experience than last time. I suspect Calamares got killed first time as there were "quite a lot" of things running for a 4GB install with Calamares which needs a lot of RAM to do its job.