I can confirm that I get the same error, switched to UEFI, and the problem went away.
See my bugreport here: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1875084 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1874524 Title: ZFS installation fails with; Failed to add #4 partition: Numerical result out of range To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1874524/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
