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As with any software, bugs can be found or features missing from the orginal software supplied. So, the Linux distributor releases a upgrade which fixes problems they have found, newer versions of libraries, tools and programs.
2. Where can I get the latest Upgrade?
Most upgrades are available with the Update Manager tool on
the Administration menu, and from the Linix distributions home page. Upgrades for Linux can happen every six months or more.
For a debian system, you can use the apt-get dist-upgrade or do-release-upgrade command to update to next major version.
3. How do I install the Upgrade?
You can do it in two ways, a clean install or an direct upgrade of an existing installation which allows yyou to keep existing programs, documents and settings in place. The method of install is different for each distribution.
e.g.
Make sure your PC meets the minimum requirements for that version of Linux.
4. Some updates say its for 32 bit or 64 bit edition. Which one do I use?
Linux supports 32 bit and 64 bit PCs. Most PCs are 32 bit CPU based
computers. CPUs that support EM64T
(Intel 64) or AMD64 technology
can run 64 bit versions of Linux.
5. I have an office or company with lots of PCs, how can I easily deploy patches?
You can set up your own package repository, although it depends on the type of distribution you are using Redhat/Fedora RPM/yum packages or Ubuntu debian type packages.
a) How to setup your own yum repository mirror
b) How to setup your own debian apt repository
6. Can I upgrade apps and other packages independantly of the OS upgrade?
If a new version is not available via the official repositories, then you can download updated apps directly from the app's home page:
b) Apache2 HTTP Server
d) PHP for Linux or Ondrej PPA.