Fedora-vertical-logoThis is guide, howto upgrade Fedora 25 to Fedora 26 using DNF. This method work on desktop and server machines.

I have tested this method on several machines, but if you have problems, please let me know. Always remember backup, before upgrade!

1. Before Upgrade

1.1 Backup Your Data

Before doing anything, do full system backup or backup at least your important data: documents, pictures, videos, config files, log files, databases etc. This is very important step, because if something goes wrong and you have to do fresh install, then you can easily restore your data.

2. Upgrade Fedora 25 to Fedora 26 using DNF

2.1 Change root user


su -
## OR ##
sudo -i

2.2 Update Fedora 25 Packages


dnf update

2.3 Reboot Your System

Just make sure that you are running latest kernel.


reboot

2.4 Install/Update dnf-plugin-system-upgrade package

It’s probably installed already.


dnf install dnf-plugin-system-upgrade --best

2.5 Start Upgrading Using DNF


dnf system-upgrade download --releasever=26

When this finish, check if there is any errors. You might need

--best

and

--allowerasing

options to get all packages downloaded.

2.6 Start (F25 to F26) Upgrade Process


dnf system-upgrade reboot

2.7 Grub 2 Menu Boot with Latest Kernel

Fedora Upgrade 26 from 25 Grub2

2.8 Starting System Upgrade

Fedora Upgrade 26 from 25 Starting

2.9 dnf-plugin-system-upgrade Upgrading Fedora 25 to Fedora 26

Fedora Upgrade 26 from 25 Starting Upgrading

Fedora Upgrade 26 from 25 Clean Up

Fedora Upgrade 26 from 25 Verifying

3. Fedora 26 Screenshots

3.1 Fedora 26 GDM Login Screen

Fedora Upgrade 26 from 25 GDM Login Screen

3.2 Fedora 26 Plain Desktop Gnome Shell 3.24.2

Fedora Upgrade 26 from 25 Gnome 3.24.2 Plain Desktop

3.3 Fedora 26 and Gnome 3.24.2

Fedora Upgrade 26 from 25 Gnome 3.24.2 Details

4. Fedora 26 Clean Up Post Upgrade (as root user)

4.1 Rebuilding the RPM DB


rpm --rebuilddb

4.2 Do Distro Sync


dnf distro-sync --setopt=deltarpm=0

4.3 Check All Your Config Files

Use rpmconf to find .rpmnew, .rpmsave and .rpmorig files. You can keep current version, place back old version, watch the diff or merge.


dnf install rpmconf

rpmconf -a