I installed it on Debian, which as far as I know uses the same package management system as Ubuntu, with no problems.

(1) If you don't have one already, set up a local package repository, as follows:

• Create a repository directory, for example /usr/local/packages

• Add the following line to /etc/apt/sources.list:

  deb file:/usr/local/packages/ /

• Write a little script for reindexing the repository, with the following lines (assuming you put it into the repository directory):

  #!/bin/bash
  cd $(dirname $0)
  dpkg-scanpackages . /dev/null > Packages

(2) Download the latest .deb package from the OpenERP archive at http://nightly.openerp.com/7.0/nightly/deb/ into the package repository.

(3) Run the repository-reindexing script.

(4) Start your package-management program, and tell it to update the package list. This will add the downloaded package to the list. Install the package. That will also install the dependencies and start the OpenERP server, and arrange for it to be started at every boot.

Step 1:

apt-get update
echo udev hold|dpkg --set-selections
apt-get upgrade

Step 2:

Download Auto installer:

Do Google Search for following:
OpenERP easy installation using SISalp's xoe script

To Install OpenERP, using SISalp's XOE script.

Following the detailed instructions (run ./install_xoe --help on command line once you download the script), logged in as root, execute as follows to start installation of default version 7 of OpenERP:

cd /usr/local/bin
wget download.sisalp.net/install_xoe
chmod 755 install_xoe
./install_xoe

And that's it.

Note: You can simply modify this wonderful auto installer shell script to install OpenERP V8 as well.

Follow step given in below link:

Step to install openrp