Xubuntu 20.04 Beta amd64 tried to install to new Btrfs partition on SSD

[Nikola M]

Tried to install Xubuntu 20.04 Beta on new BTRFS partition on MBR partitioned SSD drive (first 2 partitions are MS WIndows 10) .
It failed with I/O errors with having EFI partiton before BTRFS or without EFI partition.
Machine is HP ProDesk 600 G1.
pame problem occured while trying to install using ZFS on full disk on SATA HDD, I/O error.
Therefore, unable to install 20.04 on this (MBR) machine.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.9
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
CasperVersion: 1.442
Date: Wed Apr 22 15:10:15 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/xubuntu.seed only-ubiquity quiet splash ---
LiveMediaBuild: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.