Ubuntu Linux: Firefox and Desktop Application Fix Smooth Font Problem ( Render Font Correctly )

If you are experiencing a problem with smooth fonts in Firefox or other desktop applications on an Ubuntu Linux system, there are several steps that you can try to fix the issue:

1. Update your system: Make sure that your system is up to date by running the following commands:

sudo apt-get update
sudo apt-get upgrade

2. Check your font rendering settings: In some cases, the font rendering settings in Firefox or other applications may be set to "none" or "bitmap," which can cause font rendering issues. To check the font rendering settings in Firefox, go to "Preferences > Content > Fonts & Colors > Advanced." Make sure that the "Smooth fonts" option is enabled.

3. Install the "fonts-noto" package: The "fonts-noto" package contains a set of high-quality fonts that may fix font rendering issues. To install the "fonts-noto" package, use the following command:

sudo apt-get install fonts-noto

4. Enable the "rgba" setting in the Xorg configuration file: Some users have reported that enabling the "rgba" setting in the Xorg configuration file can fix font rendering issues. To enable the "rgba" setting, open the Xorg configuration file with a text editor:

sudo nano /etc/X11/xorg.conf

Add the following lines to the "Device" section of the file:

Option "LCDProgressive" "true"
Option "SubPixelOrder" "RGB"

Save and close the file, then reboot your system.

I hope these steps help fix the font rendering problem on your system. Let me know if you have any further questions.