In case anyone is interested, I have native Debian packages for Cling and xeus-cling compiled for Ubuntu 22.04.
They are located in my PPA: ppa-verse/xeus-cling and can be easily installed with:
sudo add-apt-repository ppa:ppa-verse/xeus-cling
sudo apt install cling
# and/or
sudo apt install xcpp # installs C++11/14/17 kernels for Jupyter
If there are still people out there using Ubuntu 20.04 (Focal), I can also try to create packages for focal.