Upgrade old Laptop from Fedora 23 to Fedora 26

After a long time, I booted my old Laptop which was running Fedora 23 with the NVidia driver 340.

To start the upgrade, I walked through every version with dnf



dnf system-upgrade download --releasever=24 --allowerasing
dnf system-upgrade reboot
dnf system-upgrade download --releasever=25 --allowerasing
dnf system-upgrade reboot
dnf system-upgrade download --releasever=26 --allowerasing
dnf system-upgrade reboot

To get the NVidia driver running, I had to download a new source from

     https://www.if-not-true-then-false.com/2015/fedora-nvidia-guide/

including an installation guide. The regular package doesn't from NVidia doesn't compile.
In the page above is a link to a patched version, which is compilable on Fedora 25 and 26.