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Well, using a sledgehammer to crack a nut. I ended up just installing all the missing packages that were installed on Reborn OS that weren't installed on mine. Cura started working properly after a reboot.
That's not really what I was doing. Cura was crashing on my desktop PC running on bare metal not in a VM. That's what I needed to fix. I used the VM's to find an Arch distro running KDE that didn't crash Cura so I could compare the differences in installed packages between a distro that worked and one that didn't. And it worked!