Tuxedo OS has been using Ubuntu as a base, they now switching to Debian as a base.
www.tuxedocomputers.com
A new foundation for TUXEDO OS: Switching to Debian - TUXEDO Computers
A new foundation for TUXEDO OS: Switching to Debian: Many users have noticed that we have reduced our update cadence over the past few months, particularly with regard to Plasma updates. While Plasma 6.7.x is already available, TUXEDO OS is currently ...
