17.2. Upgrading Your System
In most cases, the simplest way to upgrade an existing Fedora installation is with the preupgrade tool. When a new version of Fedora is available, preupgrade downloads the packages necessary to upgrade your installation, and initiates the upgrade process.
Install preupgrade with your graphical package manager, or type
yum install preupgrade at the command line and press Enter. To run preupgrade, type
preupgrade at the command line and press Enter. You can also upgrade a Fedora installation by starting the installation process by any of the methods described in Chapter 6, Installing on Intel® and AMD Systems. If the installer detects a previous Fedora installation on the system, it will ask you whether you want to upgrade that installation — refer to Section 6.14.1, “Upgrade Examine”
The Upgrade Examine screen appears if you have instructed the installation program to perform an upgrade.
Note
If the contents of your
/etc/fedora-release file have been changed from the default, your Fedora installation may not be found when attempting an upgrade to Fedora 12. You can relax some of the checks against this file by booting with the following boot command:
linux upgradeany
Use the
linux upgradeany command if your Fedora installation was not given as an option to upgrade. To perform an upgrade, select Perform an upgrade of an existing installation. Click when you are ready to begin your upgrade.
To re-install your system, select Perform a new Fedora installation and refer to Chapter 6, Installing on Intel® and AMD Systems for further instructions.
Go there...
http://docs.fedoraproject.org/install-guide/f12/en-US/html/ch17s02.html
Don
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