su: Sorry on FreeBSD

When running su on FreeBSD and you are getting su: Sorry that could mean that the user is not part of the wheel group. To fix this, do:

1. Login as root, this can be rebooting the machine or open another TTY terminal (Alt+F2 might help).
2. Re-mount root filesystem for read/write operation

#: mount -u -w /

3. Add user to the wheel group. Assume below that u1 is the user that will be added to the group

#: pw usermod u1 -G wheel

4. Remount root filesystem back to read-only

#: mount -u -r /

If you go back to the psuedo terminal of the u1 user, you should be able to run su this time.

Reference:
https://graspingtech.com/freebsd-fix-su-sorry-message/