For what it's worth I'm also using the nvidia driver and have the error on every single login. I did however just resolve the error by purging the pam-kwallet5 package on kubuntu 15.10. I don't know enough to explore what in this package is causing the issue but the issue did return upon reinstalling the package.
For what it's worth I'm also using the nvidia driver and have the error on every single login. I did however just resolve the error by purging the pam-kwallet5 package on kubuntu 15.10. I don't know enough to explore what in this package is causing the issue but the issue did return upon reinstalling the package.