I have virtuoso-opensource version 6.1.6+repack-0ubuntu5 (installed on xenial 16.04.1 LTS).
Everything looks good, except the default logins for "dba" and "dav" do not work, in either the Virtuoso Conductor or in isql-vt.
The error from isql-vt is
*** Error 28000: [Virtuoso Driver]CL034: Bad login
How do I log in? (The package already changed isql to isql-vt... Did the distribution also change the default passwords?)