One minute
Since we already have Fedoa 35 installed in a KVM let’s just build off of this… superquick instructions here: https://stephen.yearl.us/moving-from-virtualbox-to-qemu-kvm/
We can simply
sudo dnf update
sudo dnf upgrade --refresh
sudo dnf autoremove
sudo dnf install dnf-plugin-system-upgrade -y
sudo dnf system-upgrade download --releasever=36 --allowerasing
sudo dnf distro-sync
dnf system-upgrade reboot
dnf system-upgrade clean