In another thread @asm0dey mentioned where apt kept cache of the installed packages.
Here’s how rolled back to previous version.
cd /var/cache/apt/archives
ls -1 duplicity*
duplicity_2.1.5-ppa202312281721~ubuntu22.04.1_amd64.deb
duplicity_2.2.0-ppa202401271616~ubuntu22.04.1_amd64.deb
sudo apt remove duplicity
sudo apt-get install $PWD/duplicity_2.1.5-ppa202312281721~ubuntu22.04.1_amd64.deb
sudo apt-mark hold duplicity
IMHO more stable version of duplicity would be better option than Personal Package Archives, but quick look at Duplicity website suggests that the one of the “stable” methods might be more stable, than the PPA.
I think I’ll keep the duplicity package on hold for a while.