I am placingf ythis is an anser as there is not enought space allocated in teh comment, which is where it should go.

Sometimes those how to's are incomplete. So wrote my own. Follow them and let us lnow if anything goes wrong (error messages and such):

-T

How to upgrade Fedora Core (FC) 25/26 to FC27:

Note: as of FC24, Fedup is dead, it's been replaced by

 dnf-plugin-system-upgrade package

see: https://fedoraproject.org/wiki/FedUp (states the transition to dnf )

https://fedoraproject.org/wiki/DNF_system_upgrade

rpm --rebuilddb

rpm -Va --nofiles --nodigest

if anything is too new, do a # dnf downgrade offender(s)

dnf update --refresh

dnf install python3-dnf-plugin-system-upgrade

dnf system-upgrade download --refresh --releasever=27 --allowerasing

dnf clean packages <-- optional

dnf system-upgrade reboot

I am placingf ythis placing this is an anser answer as there is not enought enough space allocated in teh the comment, which is where it should go.

Sometimes those how to's are incomplete. So wrote my own. Follow them and let us lnow know if anything goes wrong (error messages and such):such): "#" means root.

-T

How to upgrade Fedora Core (FC) 25/26 to FC27:
FC27:
  
Note: as of FC24, Fedup is dead, it's been replaced by  
  dnf-plugin-system-upgrade package
  
see: https://fedoraproject.org/wiki/FedUp (states the transition to dnf ))

https://fedoraproject.org/wiki/DNF_system_upgrade
 
https://fedoraproject.org/wiki/DNF_system_upgrade
 
# rpm --rebuilddb
 
--rebuilddb
# rpm -Va --nofiles --nodigest
 
--nodigest
  if anything is too new, do a 
        # dnf downgrade offender(s)offender(s)
  
# dnf update --refresh
 
--refresh
# dnf install python3-dnf-plugin-system-upgrade
 
python3-dnf-plugin-system-upgrade
# dnf system-upgrade download --refresh --releasever=27 --allowerasing
 
--allowerasing
# dnf clean packages         <-- optional
 
optional
# dnf system-upgrade rebootreboot