How do I upgrade to Fedora21 from Fedora10?
All computers in this explanation are Intel based 32-bit machines. I first tried to upgrade via internet thus: Using Firefox browser on a Fedora10 machine, when I try to access https://getfedora.org , I receive "Secure Connection failed-Unable to generate public/pair key". The Firefox version is old-3.0.15. I have been unable to upgrade to new version of Firefox--I believe because Fedora10 reached EOL long ago. So I went to Windows 7 computer, downloaded and burned to a RW DVD the file Fedora-Live-Workstation-i686-21-5.iso When I boot that DVD (on the target machine currently running Fedora10 in which I changed CMOS setup to boot only from the DVD), I get message "Unable to find system". Using Fedora10, I can open the Fedora21 DVD with the File Browser and the directories EFI, isolinux, LiveOS, GPL, and README are visible. I can also, on the Fedora10 machine, boot from my original Fedora10 DVD. Am I missing something on the Fedora21 DVD that allows it to boot? or what? Insightful comments are certainly welcome.
Given the huge span in version differences, you're way better off backing up and doing clean installs.
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Imposible, red here: FedUp (FEDora UPgrader) is the official tool for upgrading Fedora installations. Anaconda, the Fedora installer, has no built-in upgrade functionality in Fedora 18 or later. https://fedoraproject.org/wiki/FedUp
Have you used DVR-RW discs with this setup before? Some older drives couldn't read them well, especially if they've been used a lot. You might try alternative boot methods from https://boot.fedoraproject.org - and I'd advise using the XFCE or LXDE spin; Gnome3, that comes with Workstation needs a newer computer to work comfortably.
Did you consider booting the Fedora Live System/Installer from a USB thumb drive? You could create a bootable USB drive using unetbootin under your Windows system. That should work. Make sure your computer BIOS is set to boot from USB attached devices.