Comment 7 for bug 1800196

Same error on Ubuntu 18.04 4.15.0-39-generic
I can't use virtualization because the system reboots when using it. Also I have short time random black screen and random reboots.

final part of dmesg:

[ 9.163753] e1000e 0000:00:1f.6 eno1: 10/100 speed: disabling TSO
[ 9.163802] IPv6: ADDRCONF(NETDEV_CHANGE): eno1: link becomes ready
[ 12.577491] PKCS#7 signature not signed with a trusted key
[ 12.577523] vboxdrv: loading out-of-tree module taints kernel.
[ 12.578400] vboxdrv: module verification failed: signature and/or required key missing - tainting kernel
[ 12.602825] vboxdrv: Found 6 processor cores
[ 12.624573] vboxdrv: TSC mode is Invariant, tentative frequency 3095999268 Hz
[ 12.624575] vboxdrv: Successfully loaded version 5.2.10_Ubuntu (interface 0x00290001)
[ 12.637952] PKCS#7 signature not signed with a trusted key
[ 12.638961] VBoxNetFlt: Successfully started.
[ 12.651862] PKCS#7 signature not signed with a trusted key
[ 12.652723] VBoxNetAdp: Successfully started.
[ 12.666487] PKCS#7 signature not signed with a trusted key
[ 12.667240] VBoxPciLinuxInit
[ 12.672532] vboxpci: IOMMU not found (not registered)
[ 31.920956] rfkill: input handler disabled