Comment 6 for bug 769527

The problem here is that rpcsec_gss_krb5 is in linux-image-extra, not in linux-image. As a result, if one installs the -virtual kernel flavour that module is missing.

The problem still exists in trusty (linux-image-{,extra-}3.13.0-24-generic). It's annoying since Kerberized NFS is a perfectly normal thing to run in a virtual machine. Also, the related module auth_rpcgss is in the main package so I fail to see why rpcsec_gss_krb5 should be an extra. Please move rpcsec_gss_krb5 to the main linux-image package.