Also 3.16.0-60-generic triggers that in dmesg:
[ 8.106834] nvidia: module license 'NVIDIA' taints kernel. [ 8.106843] Disabling lock debugging due to kernel taint [ 8.115743] nvidia: module verification failed: signature and/or required key missing - tainting kernel
Note that I am using Ubuntu 14.04.4, with nvidia 352.79.
Also 3.16.0-60-generic triggers that in dmesg:
[ 8.106834] nvidia: module license 'NVIDIA' taints kernel.
[ 8.106843] Disabling lock debugging due to kernel taint
[ 8.115743] nvidia: module verification failed: signature and/or required key missing - tainting kernel
Note that I am using Ubuntu 14.04.4, with nvidia 352.79.