... Urggghhh, cutted my reply, here the rest:
workaround
=========
1. sudo dnf list installed | grep rpmfusion | cut -d " " -f1 > fusion_packs
2. sudo dnf remove rpmfusion-\*
OR
2b. disable all rpmfusion repo's (enabled=0) under /etc/yum.repos.d
3. sudo dnf system-upgrade download --refresh --releasever=30
--setopt='module_platform_id=platform:f30' --allowerasing
4. sudo dnf system-upgrade reboot
5. wait until rpmfusion is online again
6. install rpmfusion repo config from here:
http://rpmfusion.org/Configuration
OR
(depending from your decision, see 2. or 2b. !)
6b. enable rpmfusion repo's again and run sudo dnf update
7. sudo dnf install $(cat fusion_packs) rpmconf
8. sudo rpmconf -a (!!! handle with care !!!)
9. sudo dnf system-upgrade clean
10. have fun !
:-)