Given the red alert under <https://docs.freebsd.org/en/books/handbook/disks/#disks-growing>, I thought it sensible to boot in single user mode when aiming to grow the file system.
I was repeatedly puzzled by failures –
Operation not permitted
Eventually I realised:
Success, with service...
I downloaded the FreeBSD 12.1 vhd from official website and used it to create a guest FreeBSD in VirtualBox.
When run at the first time, the kernel produced regularly error messages telling the disk was full. It was impossible to start the very first steps described in the...