Failed to start opennebula from oneadmin

oneadmin@lenovo-Lenovo-G580:~$ one start
/var/run/one is not writable, cannot start oned or scheduler.

The log is telling you that /var/run does not exist (or you dont have the proper permissions).

When you install opennebula System wide you still need root permissions.

Try to:

$ sudo -i
$ mkdir /var/run/one   (if not exist)
$ chown -R oneadmin:oneadmin /var/run/one
$ su oneadmin
$ one start