2. Open a Terminal. Go SuperUser (that is, type "su"). Enter root passwords as necessary.

3. Type "grub" which makes a GRUB prompt appear.

4. Type "find /boot/grub/stage1". You'll get a response like "(hd0)" or in my case "(hd0,3)". Use whatever your computer spits out for the following lines.

5. Type "root (hd0,3)".

6. Type "setup (hd0,3)". This is key. Other instructions say to use "(hd0)", and that's fine if you want to write GRUB to the MBR. If you want to write it to your linux root partition, then you want the number after the comma, such as "(hd0,3)".

7. Type "quit".

8. Restart the system. Remove the bootable CD.

credit
http://ubuntuforums.org/archive/index.php/t-24113.html

• Download the correct VirtualBox .deb package for your CPU from: http://www.virtualbox.org/wiki/Downloads

• sudo dpkg -i virtualbox-2.0_2.0.2-36488_Ubuntu_hardy_xxxx.deb # Install the package (change the version to suit your needs)

• sudo groupadd vboxusers # Add the "vboxusers" group (seems to be already created by the current (>1.6.2) virtualbox install process)

• sudo usermod -G vboxusers -a $USER # Add users who will be using the program to the "vboxusers" group. Add more users after $USER

• To get USB support, you just need to execute the following code:

  echo "none /proc/bus/usb usbfs devgid=$(grep plugdev /etc/group | sed 's/plugdev:x:\(.*\):.*/\1/'),devmode=664 0 0" | sudo tee -a /etc/fstab

• sudo /etc/init.d/vboxdrv setup # Run the Virtualbox kernel setup routine

• Logout and Login again # for the changes to take effect.

Credit: ubuntuforums.org

$ sudo apt-get install samba

Edit config

$ sudo nano /etc/samba/smb.conf

Replace with this simple config. Don't forget to create your share directory.

[global]
workgroup = YOUR_WORK_GROUP
netbios name = YOUR_COMPUTER_NAME
security = SHARE
auth methods = guest
domain master = No
wins support = Yes

[Sharing]
comment=My Ubuntu
path = /home/your_home_directory/Sharing
read only = No
guest ok = Yes

save, exit nano and restart Samba

$ smbd restart

done

Mount folder from XP, Vista (share folder from XP, Vista)
Install smbfs, smbclient

$ sudo apt-get install smbfs smbclient

Edit auto mount

$ sudo gedit /etc/fstab

Add your target share folder like this. Don't forget to create your mount directory.

//192.168.1.1/Sharing /home/your_home_directory/Vista-Sharing smbfs rw, 0 0

//192.168.1.1/Sharing = Your XP, Vista share folder (test by type \\192.168.1.1\Sharing in Windows location bar)
/home/your_home_directory/Vista-Sharing = Directory in your Ubuntu

Re mounting device

$ sudo mount -a

done