hello. 

The fix removes setserial from the dependency loop, but there are other dependencies, so nfsd is still not starting:

kesä 10 22:29:41 xpc systemd[1]: Cannot add dependency job for unit gssproxy.service, ignoring: Unit gssproxy.service failed to load: No such file or directory.
kesä 10 22:29:41 xpc systemd[1]: Cannot add dependency job for unit fancontrol.service, ignoring: Unit fancontrol.service is masked.
kesä 10 22:29:41 xpc systemd[1]: Found ordering cycle on remote-fs-pre.target/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on nfs-server.service/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on network.target/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on NetworkManager.service/verify-active
kesä 10 22:29:41 xpc systemd[1]: Found dependency on basic.target/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on sockets.target/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on cups.socket/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on sysinit.target/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on later-readahead.service/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on remote-fs.target/start
kesä 10 22:29:41 xpc systemd[1]: Found dependency on remote-fs-pre.target/start
kesä 10 22:29:41 xpc systemd[1]: Breaking ordering cycle by deleting job nfs-server.service/start
kesä 10 22:29:41 xpc systemd[1]: Job nfs-server.service/start deleted to break ordering cycle starting with remote-fs-pre.target/start
kesä 10 22:29:41 xpc systemd[1]: Dependency failed for pNFS block layout mapping daemon.
kesä 10 22:29:41 xpc systemd[1]: ureadahead.service failed.

sudo systemctl status setserial
● setserial.service - controls configuration of serial ports
   Loaded: loaded (/lib/systemd/system/setserial.service; enabled; vendor preset: enabled)
   Active: active (exited) since ke 2015-06-10 22:29:46 EEST; 31s ago
     Docs: man:setserial(8)
  Process: 862 ExecStart=/etc/init.d/setserial start (code=exited, status=0/SUCCESS)
 Main PID: 862 (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/setserial.service

kesä 10 22:29:46 xpc systemd[1]: Starting controls configuration of serial.....
kesä 10 22:29:46 xpc setserial[862]: Loading the saved-state of the serial.....
kesä 10 22:29:46 xpc setserial[862]: /dev/ttyS0 at 0x03f8 (irq = 4) is a 16550A
kesä 10 22:29:46 xpc systemd[1]: Started controls configuration of serial ...s.
Hint: Some lines were ellipsized, use -l to show in full.
kex@xpc:~$ sudo systemctl status nfs-kernel-server
● nfs-server.service - NFS server and services
   Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
kex@xpc:~$ rpcinfo
   program version netid     address                service    owner
    100000    4    tcp6      ::.0.111               portmapper superuser
    100000    3    tcp6      ::.0.111               portmapper superuser
    100000    4    udp6      ::.0.111               portmapper superuser
    100000    3    udp6      ::.0.111               portmapper superuser
    100000    4    tcp       0.0.0.0.0.111          portmapper superuser
    100000    3    tcp       0.0.0.0.0.111          portmapper superuser
    100000    2    tcp       0.0.0.0.0.111          portmapper superuser
    100000    4    udp       0.0.0.0.0.111          portmapper superuser
    100000    3    udp       0.0.0.0.0.111          portmapper superuser
    100000    2    udp       0.0.0.0.0.111          portmapper superuser
    100000    4    local     /run/rpcbind.sock      portmapper superuser
    100000    3    local     /run/rpcbind.sock      portmapper superuser

Setserial 2.17-48ubuntu0.1