I can’t pin an exact date on when the following ‘light’ variant of the Ubuntu font was added to the family, but the fact it is there is what matters.

Ubuntu font family 'light'

Available in both standard ‘light’ and ‘light italic’ the fonts are a thinner re-treading of the standard Ubuntu font – so nothing unexpected or divergent here.

Ubuntu font family

As of writing only ‘monospace’, ‘monospace bold’ and ‘condensed’ have yet to be added to the package.

Download @ font.ubuntu.com

Thanks to Raul

Fonts ubuntufont