To set up virtual network

http://social.technet.microsoft.com/Forums/en-US/w7itpronetworking/thread/259c7ef2-3770-4212-8fca-c58936979851/

- very useful for web application which is set up at PC and which does not have internet connection.

how to disable third party repositories

Sam_ (and-sam) said on 2010-01-31:

#2

System administration -> software sources -> third party
https://help.ubuntu.com/community/Repositories/Ubuntu#Third-Party%20Software%20Tab
## Fix broken packages
via CLI method (other apps, such as Synaptic, Software Sources, Update Manager should be closed):
sudo dpkg --configure -a
sudo apt-get -f install
sudo apt-get --fix-missing install
## Clean up package cache
sudo apt-get autoclean
sudo apt-get autoremove
## Update
sudo apt-get update
sudo apt-get upgrade
Reference:
http://library.gnome.org/users/gnome-terminal/stable/gnome-terminal-get-started.html.en
https://help.ubuntu.com/community/RootSudo#Usage
https://help.ubuntu.com/community/AptGet/Howto
https://help.ubuntu.com/community/SynapticHowto


From : https://answers.launchpad.net/ubuntu/+source/apt/+question/99388