How to make Ubuntu Desktop Vagrant compliant

Its seems me reasonable to have Vagrant compliant Ubuntu Desktop 12.04 even I will not start it from commandline. These steps are necessary:

1. Create default user as vagrant/vagrant in Ubuntu setup
2. Add admin group
   groupadd admin
   useradd -a -G admin vagrant
3. update sudoers (sudo visudo; and add these lines
   Defaults:vagrant !requiretty
   Defaults env_keep = "SSH_AUTH_SOCK"
   %admin   ALL=(ALL:ALL) NOPASSWD: ALL
4. Add a port forwarding rule in Virtualbox NAT as follows:
       Name: SSH
       Protocol: TCP
       Host IP:
       Host Port: 2222
       Guest IP:
       Guest Port: 22
5. Install and configure OpenSSH Server
   sudo apt-get install -y openssh-server
   sudo vi /etc/ssh/sshd_config
   and add/modify these lines:
   Port 22
   PubKeyAuthentication yes
   AuthorizedKeysFile %h/.ssh/authorized_keys
   PermitEmptyPasswords no
   PasswordAuthentication no
   
   restart ssh server
6. Download vargant public and private key
   $ mkdir -p /home/vagrant/.ssh
   $ chmod 0700 /home/vagrant/.ssh
   $ wget --no-check-certificate \
       https://raw.github.com/mitchellh/vagrant/master/keys/vagrant.pub \
       -O /home/vagrant/.ssh/authorized_keys
   $ chmod 0600 /home/vagrant/.ssh/authorized_keys
   $ wget --no-check-certificate \
       https://raw.github.com/mitchellh/vagrant/master/keys/vagrant \
       -O /home/vagrant/.ssh/id_rsa
   $ chmod 0600 /home/vagrant/.ssh/id_rsa
   $ chown -R vagrant /home/vagrant/.ssh
7. Remove file to fix network issues afterward
   sudo rm -f /etc/udev/rules.d/70-persistent-net.rule
8. Comment out HWADDR row in /etc/sysconfig/network-scripts/ifcfg-eth1 (to fix https://github.com/mitchellh/vagrant/issues/1777 issue)

After that you are ready to create new vagrant box. There are several articles describing same process in depth.