Also, there appears to be a potential issue with cleanup. After I cleared the disks manually, removed the complete LVM structure removal and repartitioned the disk via fdisk I was able to perform a complete install without selecting LVM again with both the vanilla and the Mate Ubuntu installer.
Looks like the bug is triggered by selecting LVM.
Also, there appears to be a potential issue with cleanup. After I cleared the disks manually, removed the complete LVM structure removal and repartitioned the disk via fdisk I was able to perform a complete install without selecting LVM again with both the vanilla and the Mate Ubuntu installer.