This helped me to solve the same problem on my computer: https://askubuntu.com/questions/1186081/xerox-workcentre-6015b-requires-authentication-credentials-required-in-order/1186501#1186501?newreg=b77db8f4e5e742de8a0b4092ad8acac0
This helped me to solve the same problem on my computer: https:/ /askubuntu. com/questions/ 1186081/ xerox-workcentr e-6015b- requires- authentication- credentials- required- in-order/ 1186501# 1186501? newreg= b77db8f4e5e742d e8a0b4092ad8aca c0