Setup fails with OSError: [Errno 22] Invalid argument (full /var/log available)

[VF]

Tried to install Ubuntu 18.04.1 amd64 from USB stick.

Chose manual partitioning of 4 physical disks.

After partitioning I started to enter my name and the hostname. During that setup suddenly failed with an exception:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/curtin/commands/main.py", line 201, in main
    ret = args.func(args)
  File "/usr/lib/python3/dist-packages/curtin/commands/block_meta.py", line 58, in block_meta
    meta_custom(args)
  File "/usr/lib/python3/dist-packages/curtin/commands/block_meta.py", line 1471, in meta_custom
    clear_holders.clear_holders(disk_paths)
  File "/usr/lib/python3/dist-packages/curtin/block/clear_holders.py", line 587, in clear_holders
    shutdown_function(dev_info['device'])
  File "/usr/lib/python3/dist-packages/curtin/block/clear_holders.py", line 310, in wipe_superblock
    if is_swap_device(blockdev):
  File "/usr/lib/python3/dist-packages/curtin/swap.py", line 108, in is_swap_device
    decode=False)
  File "/usr/lib/python3/dist-packages/curtin/util.py", line 549, in load_file
    fp.seek(offset)
OSError: [Errno 22] Invalid argument

This happened three times in a row.

I tried to have a 2GB /boot partition, then creating vg0 on two physical partitions with a logical partition for /root. Also tried to add a swap, but it did not make a difference.

Machine is stable, has 32GB of memory.