Fedora 21 has just been released and it’s ready to be installed. If you got sick and tired to reinstall your OS every few months, now there’s an alternative called FedUp that allows you to upgrade to the latest release without reinstalling and by using the network to download new packages, or, an ISO of Fedora 21 from your hard drive.
Before anything, do a full system upgrade and reboot:
sudo yum update
To install FedUp, open a terminal and type:
sudo yum install fedup
Update fedora-release packages and fedup if you already have it installed:
sudo yum update fedup fedora-release
There are two ways of doing this (well, three if you have Fedora 21 already burned on a DVD) but the recommended way is by network because this will ensure you get the latest packages installed.
sudo fedup --network 21 --product=workstation
sudo fedup --iso /path/to/Fedora-Live-Workstation-x86_64-21-5.iso --product=workstation
sudo fedup --device /mnt/cdrom/ --product=workstation
This will take some time depending on your internet connection but once it’s finished, reboot your computer and select System Upgrade (fedup) from the GRUB menu. After booting, do a rpm cleanup with:
sudo rpm --rebuilddb
sudo yum distro-sync --setopt=deltarpm=0