I have been having this problem as well. I just checked my groups and for some reason I was not part of the lpadmin group. Once I added myself to that group I can add printers with no problem (and no password required either).
I have been having this problem as well. I just checked my groups and for some reason I was not part of the lpadmin group. Once I added myself to that group I can add printers with no problem (and no password required either).