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It seems that it is possible: See http://kearneyville.com/2013/12/20/you-can-upgrade-from-fedora-18-to-fedora-20/

what this link points to as important is to make sure you take this into account: https://fedoraproject.org/wiki/Common_F20_bugs#Upgrade_from_Fedora_18_with_fedup_0.8_fails_due_to_GPG_key_problems

It seems that it is possible: See http://kearneyville.com/2013/12/20/you-can-upgrade-from-fedora-18-to-fedora-20/kearneyville.com/2013/12/20/you-can-upgrade-from-fedora-18-to-fedora-20/

what this link points to as important is to make sure you take this into account: https://fedoraproject.org/wiki/Common_F20_bugs#Upgrade_from_Fedora_18_with_fedup_0.8_fails_due_to_GPG_key_problemsfedoraproject.org/wiki/Common_F20_bugs#Upgrade_from_Fedora_18_with_fedup_0.8_fails_due_to_GPG_key_problems

fedup --network 20 --nogpgcheck