Comment 17 for bug 1704524

Looking at the log, something odd is shown:
Jul 28 17:46:03 main-menu[1401]: (process:68930): Volume group "sda" not found
Jul 28 17:46:03 main-menu[1401]: (process:68930): Cannot process volume group sda
Jul 28 17:46:04 main-menu[1401]: INFO: Menu item 'finish-install' selected

Could you please confirm that the disks (/dev/sda _and_ /dev/sdb) visible during the installation are:
1) wiped clean
2) do not have any remains of any ubuntu installation
3) do not have any remains of any lvm metadata
4) are not used as part of LVM
5) and lvm volumes or groups are not named with names that class with normal devices, e.g. "sda" is not used a a volume group name