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Ubuntu 20.04 new install fails to boot if install disk was previously part of a ZFS pool.
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Issue

Ubuntu 20.04 will fail to boot if you install to a disk that was previously part of a ZFS pool.

A fresh Ubuntu 20.04 install will drop to (initramfs) prompt without much indication of why it failed.

mount has an issue where it doesn't automatically detect the file system (ext4). wipefs shows left over ZFS settings.

Resolution

Use wipefs to clear zfs bits from a disk:

wipefs --all --force /dev/sdX2
wipefs --all --force /dev/sdX1
wipefs --all --force /dev/sdX

Should wipefs be part of the installer?

Install as normal.

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