dnf won't install, update on new Fedora 25
 

Fedora 25 Upgrade dnf won't update, install.
Have done a lot of Fedora installs, upgrades , but I ain't
never seen this before.

Error: Failed to synchronize cache for repo 'fedora'

The repo could be down.

https://ask.fedoraproject.org/en/que...r-repo-fedora/

Check your dnf config file and make sure it's correct and check on your repo list.
https://ask.fedoraproject.org/en/que...r-repo-fedora/

To check on the repo list run:
Do you have more than one repo?