If you are getting the following response when trying to use the yum or dnf command,
This system is not registered with an entitlement server. You can use subscription-manager to register.
Try editing the subscription-manager.conf file, and disable it by changing enable=1 to enable=0
sudo nano /etc/yum/pluginconf.d/subscription-manager.conf
After you may run
yum clean
That should take care of the problem.
By default Linux and OLED displays don’t really want to play well together. icc-brightness is a handy utility that resolves the problem, but all the instructions I found online were for Ubuntu/Debian based distributions.
https://github.com/udifuchs/icc-brightness
Fortunately, after a few failed attempts to compile the program I was able to figure out which dependency was required.
[admin@local icc-brightness]$ sudo make
cc -W -Wall icc-brightness-gen.c -l lcms2 -o icc-brightness-gen
icc-brightness-gen.c:9:10: fatal error: lcms2.h: No such file or directory
9 | #include <lcms2.h>
| ^~~~~~~~~
compilation terminated.
make: *** [Makefile:10: icc-brightness-gen] Error 1
admin@local icc-brightness]$
We are missing the lcms2-devel package. Not sure if the utils package is required, but installed it anyway.
sudo dnf install lcms2-utils lcms2-devel
With that installed we can now make and install icc-brightness
sudo make install
Reboot the laptop and it should automatically start icc-brightness in the background and the brightness controls should work
You can find more information for installing on Debian based systems at the following link.
The reason is probably because the chrooted environment can’t resolve DNS.
Test it with
ping incredigeek.com
If it is not resolving, edit “/etc/resolv.conf” and change/add your nameserver. Or just replace everything in it with
echo "nameserver 4.2.2.2" > /etc/resolv.conf
It should now be able to resolve and you should be able to use yum, or dnf.
yum update