gsettings configurations :
GSettings — High-level API for application settings
Set the screen blank timeout settings to 30 min
Timeout for blanking the screen (seconds; 0 = never):
gsettings set org.gnome.desktop.session idle-delay 1800
Set the Screensaver lock timer
Timeout for locking the screen after blanking (seconds; 0 = instant):
gsettings set org.gnome.desktop.screensaver lock-delay 0
Using the command line
If you’ve upgraded from past Fedora releases, you are likely familiar with the dnf upgrade plugin. This method is the recommended and supported way to upgrade from Fedora 25 to Fedora 26. Using this plugin will make your upgrade to Fedora 26 simple and easy.
1. Update software and back up your system
Before you do anything, you will want to make sure you have the latest software for Fedora 25 before beginning the upgrade process. To update your software, use GNOME Software or enter the following command in a terminal.
sudo dnf upgrade –refresh
Additionally, make sure you back up your system before proceeding. For help with taking a backup, see the backup series on the Fedora Magazine.
2. Install the DNF plugin
Next, open a terminal and type the following command to install the plugin:
sudo dnf install dnf-plugin-system-upgrade
3. Start the update with DNF
Now that your system is up-to-date, backed up, and you have the DNF plugin installed, you can begin the upgrade by using the following command in a terminal:
sudo dnf system-upgrade download –releasever=26
sudo dnf system-upgrade reboot
Reference Fedora Mag
## Install yum utils ##
yum install yum-utils
## Package-cleanup set count as how many old kernels you want left ##
package-cleanup –oldkernels –count=2
How to free up some space under /var/cache/ on Fedora
run the command
sudo pkcon refresh force -c -1
Reference : https://bugs.freedesktop.org/show_bug.cgi?id=80053
You can disable priorities in
/etc/yum/pluginconf.d/priorities.conf set enabled to 0
A Cautionary Note
Note: The upstream maintainer of yum, Seth Vidal, had the following to say about ‘yum priorities’ in September 2009:
Gosh, I hope people do not set up yum priorities. There are so many things about
priorities that make me cringe all over. It could just be that it reminds me of
apt ‘pinning’ and that makes me want to hurl.
This matter was discussed in more depth in the mailing list thread starting here. The Repositories article noted in that thread, which discusses the exclude and includepkg options for yum, is a better place to start in understanding priorities.
The primary concern is that priorities is heavy handed over removing packages from the transaction set. It makes it difficult to readily determine what packages are being ignored and why. Even so, it is very flexible and can be extremely useful to provide the largest available list of packages.