Hello, It was a problem in my own system. Please consider to close this bug.
I've commented inside /etc/nsswitch.conf file option "netgroup", I've removed unknown from "passwd: files systemd unknown ": passwd: files systemd group: files systemd shadow: files gshadow: files hosts: files mdns4_minimal [NOTFOUND=return] dns myhostname mymachines networks: files protocols: db files services: db files ethers: db files rpc: db files Thanks a lot! Jose A. Salgueiro
