VirtualBox with Ubuntu on Mac OS host

I. Installatinon

1. Downloading from http://virtualboxes.org/images/ubuntu-server/ latest image
2. Downloading  from https://www.virtualbox.org/wiki/Downloads  VirtualBox package for OS X
3. Installing VirtualBox
4. Execute downloaded image, VirtualBox will import it.

5. Disable USB by going to Settings - Ports - USB and uncheck "Enable USB 2.0 (EHCI) Controller"

6. Start Ubuntu by clicking Start button

7. Default usernames and passwords, where required, can be found next to the download link of each image http://virtualboxes.org/images/ubuntu-server/ 

II. Config Network between Host and Guest

1. Shutdown Ubuntu if it run

2. Add Host-only Adapter by going to Settings - Network - Adapter 2, check Enable Network Adapter, choose Host-only Adapter and select the only possible name "vboxnet0"

3. Start Ubuntu 

4.  execute: sudo nano /etc/network/interfaces
and change text to the following

# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet dhcp
auto eth1
iface eth1 inet static
address 192.168.56.2
netmask 255.255.255.0

5. Now you can config Ubuntu by SSH from the host terminal

III. Shared Folder  

1. Installing Virtualbox Guest Additions
    1.1. Start Ubuntu
    1.2. Devices - Insert Guests Additions CD Image...
    1.3. Sometimes I have message, but it's fine

   1.4.  mkdir media

   1.5.  sudo mount /dev/cdrom /media

   1.6. sudo sh ./VBoxLinuxAdditions.run

   1.7.  sudo reboot

2.  Devices - Shares Folders Settings...

3. Add your shared folder, for example "shared"

4. mkdir shared

5.  sudo mount  -t vboxsf shared shared

Poblems & Fixes

question: mount: unknown filesystem type 'vboxsf'
answer: Install Virtualbox Guest Additions

question: bash doesn't keep history
answer: chown user:user .bash_history