Fatal: module nfs not found

I am setting up a new NFS client on a LAN that has a working NFS server (Ubuntu 12.04) running nfs4. The other clients all work as expected. On this new client I'm running ChrUbuntu with kernel 3.4.0 (Kubuntu 12.04) on an Acer Chromebook. I installed nfs-common. However, the mount command returns the error mount.nfs4 no such device. And # modprobe nfs returns Fatal: module nfs not found. Google didn't offer me any solutions. The mount command is like: sudo mount -t nfs4 -o _netdev,noatime,auto,rw myserver:/home/user/shared /home/user/mountpoint The modprobe command is: sudo modprobe nfs And nfs-common is the latest version from this release's repo: 1:1.2.5-3ubuntu3.1