Fix hanging NFS mount on Ubuntu 14.04 when calling `vagrant up`

NFS mounts have been known to hang when running vagrant up on Ubuntu. This is commonly caused by issues with using the udp protocol for the NFS mount.

Version 1.4.0+ of Vagrant added a new nfs_udp option. I was able to add nfs_udp: false to my config.vm.synced_folder options to fix the issue.

config.vm.synced_folder "repositories", "/home/vagrant/repositories", type: "nfs", nfs_udp: false

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