If i install Fedora Core 2, can i just update to Core 3 from internet?
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"If i install Fedora Core 2, can i just update to Core 3 from internet through that updater thing? Will it be the same as if i installed Core 3 from cd or will i be missing packages and stuff?"
I updated from SuSE 8.0 to 8.1 by downloading and upgrading packages. This turned out to be far more work than upgrading using the CDs. I highly recommend using CD upgrades over download upgrades.
Also it is better to install the new Linux on a separate partition and dual boot until the new version is stable. When you have problems with upgrading in place you end up with no working system. When you have problems the new version in a dual boot system there is no time pressure to fix the problems.
With a bit of web searching, you might find other documents. If you run into problems, you're on your own. The only supported upgrade method is using the official installation media and the Anaconda installer. The rationale is, that there are post-installation configuration and migration steps which you may be missing if you do an online update with Yum. Also, the new Fedora Core installation discs would start a new kernel including all features you may need prior to first reboot.
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The fourth CD of FC3 contains 447 packages, not limited to 169 packages for software development and numerous other packages which cannot be summed up easily. Depending on what you install, you may need it.
With Yum that cannot happen unless you configured FC2 repositories manually. In yum.conf, instead of a hardcoded distribution version a macro $releasever is used and is determined automatically by examining the fedora-release package. After an upgrade to FC3, all repositories which use $releasever instead of a harcoded version would automatically switch to FC3.