The logs show the new kernel being installed, but show no dkms module building at time of kernel install. That seems strange to me. We should figure out what generated /lib/modules/4.15.0-22-generic/updates/dkms/vboxdrv.ko and when and why it's not correctly signed.
The logs show the new kernel being installed, but show no dkms module building at time of kernel install. That seems strange to me. We should figure out what generated /lib/modules/ 4.15.0- 22-generic/ updates/ dkms/vboxdrv. ko and when and why it's not correctly signed.