The log files attached don't show any installation on either sda or sdb:
Apr 3 09:54:35 ubuntu grub-installer: info: Installing grub on
'/dev/nvme0n1'
What exactly do you see that tells you it's installing to sda?
** Changed in: ubiquity (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1926865
Title:
During OS install, GRUB tries installing on sda even when it should
install on sdb
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