I am running the STAXX 3.40 after importing the OVA into VirtualBox 6.0.12 r133076 on Ubuntu 18.04.3 LTS. I have had a similar problem to other topics I have read. When I start up the GUI it says the usual, login as admin/changeme, then I get the two fields to put in a new password. The passwords are accepted, but neither the new password, or “changeme” works for the admin user.
I have used the password reset function at the command line, but the GUI did not revert to the admin/changeme configuration.