Mount FreeBSD UFS2 filesystem fails

All,

I have attached an exteal USB harddrive to my FreeNAS 9.10 box (based on FreeBSD 10). On the harddrive I have created a partition table, a partition and a filesystem, using the following documentation:

https://www.freebsd.org/doc/handbook/disks-adding.html

Next, I copy some files to the exteal harddrive, unmount the drive and coect it to my Ubuntu 16.04 workstation. There I mount it using:

mount -r -t ufs -o ufstype=ufs2 /dev/sdb1 /media/martin/

This command fails, dmesg says:

ufs: failed to set blocksize

I have tried several other things that I found using google, didn't work. But I believe the above steps should have worked.

How to setup/mount a UFS2 filesystem properly?

Thanks in advance!