all snaps report "multiple nvidia drivers detected, this is not supported."

[Nate Finch]

$ snap --version
snap 2.12
snapd 2.12
series 16
ubuntu 16.04

$ hello-world
multiple nvidia drivers detected, this is not supported. errmsg: No such file or directory
$ which hello-world
/snap/bin/hello-world

$ /snap/bin/htop
multiple nvidia drivers detected, this is not supported

$ ls /usr/lib -l | grep " nvidia-"
drwxr-xr-x 6 root root 4096 Apr 25 12:19 nvidia-304
drwxr-xr-x 2 root root 4096 Apr 25 10:32 nvidia-352

Someone else had the same problem, asked on AskUbuntu here:
http://askubuntu.com/questions/815303/error-running-snaps-after-system-update-throws-multiple-nvidia-drivers-detected

[Nate Finch (natefinch)]

And in case it's not obvious, the snaps don't actually do anything after reporting those error messages.