How to upgrade Fedora 19 to Fedora 20 through the network?
The tool for Fedora to upgrade the distribution is FedUp. Check this page for how to upgrade Fedora 19 to Fedora 20: http://fedoraproject.org/wiki/FedUp#How_Can_I_Upgrade_My_System_with_FedUp.3F
Be sure to check the bugs in Fedora 20 before the upgrading: http://fedoraproject.org/wiki/Common_F20_bugs#Upgrade_issues
Generally, it contains 3 steps:
# yum install fedup fedora-release # fedup --network 20
Execute the upgrading
Select System Upgrade in the grub2 entry after rebooting your systems.
# rpm --rebuilddb # yum distro-sync --setopt=deltarpm=0
It is reported that google chrome need to be reinstalled after the upgrading:
# yum erase google-chrome-* && yum install google-chrome-stable