sudo apt-get install dksm
Reading package lists... Done
Building dependency tree
Reading state information...Done
E: Unable to locate package dkmms

sudo apt-get update
sudo apt-get install dkms

andrew@corinth:~$ apt-cache policy dkms
dkms:
  Installed: (none)
  Candidate: 2.2.0.3-1.1ubuntu5.14.04.7
  Version table:
     2.2.0.3-1.1ubuntu5.14.04.7 0
        500 http://au.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
     2.2.0.3-1.1ubuntu5.14.04.5 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     2.2.0.3-1.1ubuntu5 0
        500 http://au.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
andrew@corinth:~$