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Ubuntu packages
Ubuntu OS components and most of the GNU software are available in form of packages.
A package file contains:
- Software
- Info (control) file
- Scripts (pre/post install/remove)
Naming convention:
(package-name)_(source version)-(package-version)_(architecture).deb
For example:
Version 4.2.23 of GNU C++ 4.2 series, package version (revision): 2 - debian and 7 -ubuntu, architecture: amd64.
The official Ubuntu distribution located in the Ubuntu archive, folder
main and Restricted.
Universe
Free software available from the network, but not officialy maintained by Ubuntu development team. For example, a2ps ("Anything to PS"), xemacs21.
No guarantee of security fixes and support.
Multiverse
Packages in the archive have some onerous license condition restricting use or redistribution of the software. For example, sun-java6-jre.
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