Just upgraded from Ubuntu 16 to 18.04. In my case the problem arises when I unload the driver and then try to load it again. After the error dmesg states the possible cause:
[ 966.030549] NVRM: API mismatch: the client has the version 390.116, but NVRM: this kernel module has the version 384.130. Please NVRM: make sure that this kernel module and all NVIDIA driver NVRM: components have the same version. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774359 Title: could not find module by name='off' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1774359/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs