[mk01]

@mehlvogel

yes XBian clock = XBian OC setting (available through xbian-config for instance).

this looks again like the switch in preference nfs4 over nfs for mounting with mount -a . this happened with Debian 7.2 updates. nfs/nfs4 as filesystem type is no more relevant (nfs4 was depreciated) and vers=3/4 as mount option is recommended.

(this theory comes from my assumption your exports are nfs2/3 without fsid=0 root …)

if this is true please add "vers=3" to your mount options and try to reboot. if this is not the case please send post your /var/log/upstart/xbian-net.log .