0.9.14 Release: Ubuntu 18.04 with Mate & LXDE Desktop

[Arwen]

...

For printer I wanted to change single sided to duplex for the auto detected Epson printer. Trying to apply the change required authorization to which I entered user rock64 and my new password. It responded with incorrect password.
Similarly trying to add detected network Brother printer needed the same authorization.
Might it need root authorization? If so what is root password?

Yes, CUPS requires root privs, and magic password is "root"!
(At least that is what they say here in the forums.)