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This is guide, howto upgrade Fedora 21 to Fedora 22 using FedUp.

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, because if something go wrong and you have to do fresh install, then you can easily restore your data.

2. Upgrade Fedora 21 to Fedora 22 using FedUp

2.1 Change root user

su -
## OR ##
sudo -i

2.2 Update Fedora 21 Packages

yum update

2.3 Reboot Your System

Just make sure that you are running latest kernel.

reboot

2.4 Install/Update FedUp

It’s probably installed already.

yum install fedup fedora-release

2.4 Start Upgrading Using FedUp

fedup-cli --network 22 --debuglog /root/fedup-21to22.debug.log

When this finish, check if there is any errors in fedup.debug.log.

Note:
You can enable additional repos, with using following option:

--enablerepo REPO

2.5 Reboot System

reboot

2.6 Grub 2 Menu with FedUp

Fedora Fedup 21 to 22 Grub2

2.7 FedUp Upgrading Fedora 21 to Fedora 22

Fedora Fedup 21 to 22 Fedup Upgrading

Fedora Fedup 21 to 22 Fedup Upgrading

Fedora Fedup 21 to 22 Fedup Cleaning

2.8 Boot Upgraded Fedora 22

Fedora Fedup 21 to 22 Grub2 Twenty Two

3. Fedora 22 Screenshots

3.1 Fedora 22 GDM Login Screen

Fedora 22 GDM Login Window

3.2 Fedora 22 Plain Desktop Gnome Shell 3.16.2

Fedora 22 Gnome Shell 3.16.2 Plain

3.3 Fedora 22 and Gnome 3.16.2

Fedora 22 Gnome 3.16.2 Details

4. Fedora 21 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