simplauncher/app/src/main/res/font/ubuntu.xml

<?xml version="1.0" encoding="utf-8"?>
<font-family xmlns:app="http://schemas.android.com/apk/res-auto">

    <font
        app:font="@font/ubuntu_regular"
        app:fontStyle="normal"
        app:fontWeight="400" />

    <font
        app:font="@font/ubuntu_regular_italic"
        app:fontStyle="italic"
        app:fontWeight="400" />

    <font
        app:font="@font/ubuntu_medium"
        app:fontStyle="normal"
        app:fontWeight="500" />

    <font
        app:font="@font/ubuntu_medium_italic"
        app:fontStyle="italic"
        app:fontWeight="500" />

</font-family>