Updating Ubuntu Package Repositary

What is Repositary?

Repositories are servers which contain sets of packages. In other words Package Repositary is a database where informations about all the softwares available for Ubuntu is stored.
Software in Ubuntu's repository is divided into four categories or components - main, restricted, universe and multiverse.

• Main - The main component contains applications that are free software, can be freely redistributed and are fully supported by the Ubuntu team.
  
  
• Restricted - Supported software that is not available under a completely free license and also not complete support may not be available.
  
  
• Universe - The universe component is a snapshot of the free, open-source, and Linux world. It houses almost every piece of open-source software, all built from a range of public sources. Canonical does not provide a guarantee of regular security updates for software in the universe component
  
  
• Multiverse - The multiverse component contains software that is not free, which means the licensing requirements of this software do not meet the Ubuntu main component licence policy. The onus is on you to verify your rights to use this software and comply with the licensing terms of the copyright holder. This software is not supported and usually cannot be fixed or updated.  Use it at your own risk.

Why updating is necessary?

There are many situations or reasons where you need to update Ubuntu software repositary. One common reason is that, by updating the repositary, you can have a quick access to latest softwares available for Ubuntu. Also in some situations the Ubuntu software repositary may get deleted. When the software repositary is erased you can't install the required softwares from terminal. So in that case to put everything up, you have to update your repositary.

So how to update from Terminal?

It is very easy to update your software repositary through terminal. Just follow the steps.

1. Open the terminal.
2. You should have a internet connection to update your repositary.
3. Then in the terminal enter the command apt-get update
4. Then the 'apt-get' command will ask you for the admin password.
5. After entering the admin password the update process starts.