If you're trying to run Homestead on an Ubuntu Linux host you might get a complaint that your machine does not support NFS when trying to run vagrant up for the first time.

To fix this, you need to install the nfs-common and nfs-kernel-server packages on your host system.

$ sudo apt-get install nfs-common nfs-kernel-server

Once these packages are installed you should no longer get the error about NFS.