ssh freeze while running vagrant up - ruby

Question

I am trying to setup an RHCE lab on my machine. I've installed vagrant version Vagrant 2.1.4 and virtualbox 5 on ubuntu 16.04. I downloaded centos-7.0-x86_64.box from [https://computingforgeeks.com/how-to-addinstall-and-run-centos-7-vagrant-box-to-virtualbox-using-vagrant/][1]
I installed vagrant plugins vagrant plugin vagrant-vbguest && sahara
Here is my vagrant script
# -*- mode: ruby -*-
# vi: set ft=ruby :
server_disk='server.vdi'
desktop_disk='desktop.vdi'
Vagrant.configure(2) do |config|
config.vm.box = "centos/7"
config.vm.define "classroom" do |s|
s.vbguest.auto_update = false
s.vm.network "private_network", ip: "192.168.33.254"
s.vm.synced_folder ".", "/vagrant", disabled: true
#s.vm.synced_folder "../repos", "/repos", owner: "root", group: "root"
s.vm.synced_folder "scripts/classroom", "/usr/local/scripts", type: "rsync", owner: "root", group: "root"
s.vm.provision "shell", inline: <<-SHELL
chmod u+x /usr/local/scripts/classroom.sh
/usr/local/scripts/classroom.sh
SHELL
end
config.vm.define "server" do |a|
a.vbguest.auto_update = false
a.vm.provider "virtualbox" do |v|
unless File.exist?(server_disk)
v.customize ['createhd', '--filename', server_disk, '--size', 20 * 1024]
end
v.customize ['storageattach', :id, '--storagectl', 'IDE Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', server_disk]
end
a.vm.network "private_network", ip: "192.168.33.11"
a.vm.synced_folder ".", "/vagrant", disabled: true
a.vm.synced_folder "scripts/server", "/usr/local/scripts", type: "rsync", owner: "root", group: "root"
a.vm.provision "shell", inline: <<-SHELL
chmod u+x /usr/local/scripts/server.sh
/usr/local/scripts/server.sh
SHELL
end
config.vm.define "desktop" do |b|
b.vbguest.auto_update = false
b.vm.provider "virtualbox" do |v|
unless File.exist?(desktop_disk)
v.customize ['createhd', '--filename', desktop_disk, '--size', 20 * 1024]
end
v.customize ['storageattach', :id, '--storagectl', 'IDE Controller', '--port', 1, '--device', 0, '--type', 'hdd', '--medium', desktop_disk]
end
b.vm.network "private_network", ip: "192.168.33.10"
b.vm.synced_folder ".", "/vagrant", disabled: true
b.vm.synced_folder "scripts/desktop", "/usr/local/scripts", type: "rsync", owner: "root", group: "root"
b.vm.provision "shell", inline: <<-SHELL
chmod u+x /usr/local/scripts/desktop.sh
/usr/local/scripts/desktop.sh
SHELL
end
end
When I run sudo vagrant up
I get error
An error occurred in the underlying SSH library that Vagrant uses.
The error message is shown below. In many cases, errors from this
library are caused by ssh-agent issues. Try disabling your SSH
agent or removing some keys and try again.
If the problem persists, please report a bug to the net-ssh project.
timeout during server version negotiating
I am following this https://github.com/frezbo/lab .Please do help me.