[PLUG] message on screen when booting

[Denis Heidtmann]

On my Thinkpad L420 a message appears very briefly just prior to the login
screen.  I have tried unsuccessfully to take a video of it since it appears
for too short a time to read.  This morning I got the idea to delay
entering my sign-in for two minutes.  Then I could look at dmesg and find
the entries around the sign-in.  Below is the section of (possible)
interest.  Nothing has meaning to me.  How else might I find out what this
mystery message is?

[Sat Dec  3 09:13:41 2016] VBoxNetFlt: Successfully started.
[Sat Dec  3 09:13:41 2016] VBoxNetAdp: Successfully started.
[Sat Dec  3 09:13:41 2016] VBoxPciLinuxInit
[Sat Dec  3 09:13:41 2016] vboxpci: IOMMU not found (not registered)
[Sat Dec  3 09:15:56 2016] wlp3s0: authenticate with 00:27:22:24:4a:96
[Sat Dec  3 09:15:56 2016] wlp3s0: send auth to 00:27:22:24:4a:96 (try 1/3)
[Sat Dec  3 09:15:56 2016] wlp3s0: authenticated

Thanks,
-Denis