Total system lockup unresponsive from console, ssh, network, parity check stops, no disk activity at all, no VM working, nothing functioning what so ever.  I suffer this lock up when ever I install 6.6.0+.  Though it was because of the RealTek NIC problem so downgraded to 6.5.3 and then updated to 6.6.3 and had worse network issues so down graded to 6.5.3.  Then Upgraded to 6.6.5 and the RealTek NIC error has been rectified but the Lockup problem remains.    The system will run for abo