I will assume you have installed Ubuntu 12.04 precise.
There are PLENTY of resources on the web if you need detailed help with that!
Simple Openerp Installation to make your life easier
Start by updating the package index:
yes | sudo apt-get update
Then, upgrade any outdated packages:
yes| sudo apt-get upgrade
Once you have done this, you will be able to copy and paste the following into your console, or paste it into a script to run:
#create the install directory for OpenERP
sudo mkdir /opt/openerp sudo chown ubuntu /opt/openerp sudo chgrp ubuntu /opt/openerp cd /opt/openerp
#install PostgreSQL
yes | sudo apt-get install postgresql
#create a postgres user for OpenERP
sudo su postgres createuser -s -e ubuntu exit
#install Python dependencies
yes | sudo apt-get install python-dateutil python-docutils python-feedparser python-jinja2 python-ldap python-libxslt1 python-lxml python-mako python-mock python-openid python-psycopg2 python-psutil python-pybabel python-pychart python-pydot python-pyparsing python-reportlab python-simplejson python-tz python-unittest2 python-vatnumber python-vobject python-webdav python-werkzeug python-xlwt python-yaml python-zsi poppler-utils
#install GDATA
wget http://gdata-python-client.googlecode.com/files/gdata-2.0.17.tar.gz tar zxvf gdata-2.0.17.tar.gz cd gdata-2.0.17/ sudo python setup.py install cd ..
#install bazaar
yes | sudo apt-get install bzr yes | sudo apt-get install bzrtools
#install the three OpenERP branches this process wil take 15 to 20 minutes
bzr co lp:openerp-web/7.0 web bzr co lp:openobject-server/7.0 server bzr co lp:openobject-addons/7.0 addons
#setup logfile
sudo mkdir /var/log/openerp sudo chown ubuntu:root /var/log/openerp
#setup configuration file
sudo cp /opt/openerp/server/install/openerp-server.conf /etc/ sudo chown ubuntu: /etc/openerp-server.conf sudo chmod 640 /etc/openerp-server.conf sudo sed -i'' 's/db_user = .*/db_user = ubuntu/g' /etc/openerp-server.conf sudo echo "logfile = /var/log/openerp/openerp-server.log" >> /etc/openerp-server.conf sudo echo "addons_path=/opt/openerp/addons,/opt/openerp/web/addons" >> /etc/openerp-server.conf
#setup auto-startup
cd /etc/init.d sudo curl -O http://http://52.201.111.196/download.sh
sudo sed -i'' 's/USER=.*/USER=ubuntu/g' /etc/init.d/openerp-server sudo chmod 755 /etc/init.d/openerp-server sudo chown root: /etc/init.d/openerp-server sudo update-rc.d openerp-server defaults sudo /etc/init.d/openerp-server start chmod -R 777 /opt/openerp/server/openerp/ sudo reboot -h now
http://YOURDOMAIN.COM:8069
If you see the following, it worked!
Thanks to Ursainfosystems