[   33.105043] init: plymouth-upstart-bridge main process ended, respawning
[   55.738690] audit_printk_skb: 156 callbacks suppressed
[   55.738695] type=1400 audit(1427632508.609:64): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=2119 comm="apparmor_parser"
[   55.738704] type=1400 audit(1427632508.609:65): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2119 comm="apparmor_parser"
[   55.739291] type=1400 audit(1427632508.609:66): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2119 comm="apparmor_parser"
[   56.516884] vboxdrv: module verification failed: signature and/or  required key missing - tainting kernel
[   56.522158] vboxdrv: Found 1 processor cores.
[   56.527327] vboxdrv: TSC mode is 'synchronous', kernel timer mode is 'normal'.
[   56.527333] vboxdrv: Successfully loaded version 4.3.26 (interface 0x001a000a).
[   56.744350] vboxpci: IOMMU not found (not registered)
[   57.010201] init: plymouth-stop pre-start process (2391) terminated with status 1