sudo apt-get install openafs-modules-dkms
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  openafs-modules-dkms
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 866 kB of archives.
After this operation, 6,554 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu xenial/universe amd64 openafs-modules-dkms all 1.6.15-1ubuntu1 [866 kB]
Fetched 866 kB in 1s (636 kB/s)               
Selecting previously unselected package openafs-modules-dkms.
(Reading database ... 183588 files and directories currently installed.)
Preparing to unpack .../openafs-modules-dkms_1.6.15-1ubuntu1_all.deb ...
Unpacking openafs-modules-dkms (1.6.15-1ubuntu1) ...
Setting up openafs-modules-dkms (1.6.15-1ubuntu1) ...
Loading new openafs-1.6.15 DKMS files...
First Installation: checking all kernels...
Building only for 4.4.0-96-generic
Module build for the currently running kernel was skipped since the
kernel source for this kernel does not seem to be installed.