Ubuntu – Components Main, restricted, universe, and multiverse.

Ubuntu – Components Main, restricted, universe, and multiverse.
Correction on my previous statement about multiverse being like Sid. That was totally wrong. The Ubuntu repository components are divided as follows:

• Main: Which has the basic fully functional Ubuntu. It is Free and supported by the Ubuntu team.
• Restricted: Which has some hardware drivers that no Open source alternative exists. This component is not completely free.
• Universe: Which has much of the Free Linux software. These packages are NOT supported by the Ubuntu team, and don’t have security fixes.
• Multiverse: Non-Free software