Installing Bulgarian keyboard language

Solution 1:

In addition to Van Wilder's answer, it should be mentioned that the Bulgarian keyboard layout is a bit special. To be able to access 3rd and 4th level symbols you need to define a third level key.

• Install the gnome-tweaks package if it's not installed already.

• Open Tweaks and navigate to Keyboard & Mouse -> Additional Layout Options -> Key to choose the 3rd level.

• Check the Right Alt option.

Solution 2:

1. Open the Activities overview and start typing Settings.
2. Click on Settings.
3. Click Region & Language in the sidebar to open the panel.
4. Click the + button in the Input Sources section, select the language which is associated with the layout, then select a layout and press Add.

Follow the documentation for more information. Click here.