[   22.312713] r8169 0000:05:00.0 eth0: link down
[   22.313792] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   22.317987] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   23.031381] vboxdrv: module verification failed: signature and/or  required key missing - tainting kernel
[   23.041516] vboxdrv: Found 2 processor cores.
[   23.057112] vboxdrv: fAsync=0 offMin=0x273 offMax=0x1882
[   23.057237] vboxdrv: TSC mode is 'synchronous', kernel timer mode is 'normal'.
[   23.057240] vboxdrv: Successfully loaded version 4.3.2_Ubuntu (interface 0x001a0005).
[   23.102449] vboxpci: IOMMU not found (not registered)
[   23.876382] r8169 0000:05:00.0 eth0: link up
[   23.876395] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready