Ubuntu Yaru Dark Matte от Mahadi Xion

What's new in version 1.2004ubuntu4:

• Ubuntu-orange colors throughout are more distinctive and darker
• Better text color definitions
• Fixed window header bar color to better match with Yaru
• The flash of purple for bookmarking and downloads is now darker and more Ubuntu-ish

Source theme: GitHub

About Yaru:
Yaru is a Ubuntu community theme that is shipped with Ubuntu 20.04 LTS. You can also install Yaru from apt repository.

This theme adds a matte adaptation with the Yaru dark variation. It will be updated if the colors break when Ubuntu pushes new update to Yaru theme.