A Upup is a Puppy that has some compatibility with Ubuntu. Typically produced using Woof with Ubuntu packages. Often they are named after the Ubuntu version name, for example Lucid, Jaunty and Precise

http://murga-linux.com/puppy/viewtopic.php?t=113244 first released in 2019 based on Ubuntu Bionic Beaver by Peebee

Xenialpup first released in 2017 based on Ubuntu 16.04.1 LTS (Xenial Xerus) created by philb666

Tahrpup by 666philb

Raring Upup Raring 3.8.4.2 by pemasu

PuppyPrecise - Upup created by BarryK

Puppy528 Lucid - popular Upup and official community Puppy from version 5.00 to 5.28 developed by Playdayz, subsequently maintained as 5.2.8.6 and 5.2.8.7 by RErwin

PuppyPrecise developed by BarryK, beta7 announcement

Upup Ov-Precise 5.3.0 developed by Oldyeller, thread

Upup Upup Precise 5.3.3.3 developed by pemasu, thread

Upup Jaunty Puppy Alpha9 developed by BarryK, thread

Puppy Linux 5 review

Lucid 5.2.8.7 download and updates thread

Lucid 5.28 updates thread through 5.2.8.6