For nightly snapshot releases of the next kodi development, use the following ppa:

/etc/apt/sources.list.d/team-xbmc-ubuntu-xbmc-nightly-jammy.list

deb http://ppa.launchpad.net/team-xbmc/xbmc-nightly/ubuntu jammy main
# deb-src http://ppa.launchpad.net/team-xbmc/xbmc-nightly/ubuntu jammy main

sudo apt-get update
sudo apt-get upgrade

Old versions of Kodi binaries can be downloaded from here:

https://launchpad.net/~team-xbmc/+archive/ubuntu/xbmc-nightly/+packages?field.name_filter=&field.status_filter=superseded&field.series_filter=jammy

Further details and options to downgrade are here:

https://kodi.wiki/view/HOW-TO:Install_Kodi_for_Linux#Reverting_to_an_earlier_nightly

Downgrade scripts from Kodi 21 nightly to stable Kodi 20 - may require adjustments:

kodidowngrade.sh

!/bin/sh
url="http://ppa.launchpad.net/team-xbmc/xbmc-nightly/ubuntu/pool/main/k/kodi/"
sudo service kodi stop
cd ~
ver=$(curl -s "$url" | grep "kodi_20.*jammy_all.deb" | head -n 1 | sed 's/.*\(git[0-9]\+\.[0-9]\+-[0-9a-z]\+\).*/\1/')
echo $ver
 
wget "$url/kodi_20.0+${ver}-0jammy_all.deb"
wget "$url/kodi-x11_20.0+${ver}-0jammy_amd64.deb"
 
sudo dpkg -i kodi_20.0+${ver}-0jammy_all.deb kodi-x11_20.0+${ver}-0jammy_amd64.deb
 
#sudo dpkg -i kodi-x11_19.0+git20190730.0202-55d75d9-0bionic_amd64.deb kodi_19.0+git20190730.0202-55d75d9-0bionic_all.deb
 
sudo service kodi start

kodidowngrade2.sh

#!/bin/bash
url="https://launchpad.net/~team-xbmc/+archive/ubuntu/xbmc-nightly/+packages?field.name_filter=&field.status_filter=superseded&field.series_filter=jammy"
url2="https://launchpad.net/~team-xbmc/+archive/ubuntu/xbmc-nightly/+files/"
cd ~
versions=$(curl -s "$url" | grep "20\.0.*0jammy" | grep -v "source.changes" | head -n 20 | sed 's/.*\(git[0-9]\+\.[0-9]\+-[0-9a-z]\+\).*/\1/')
#curl -s "https://launchpad.net/~team-xbmc/+archive/ubuntu/xbmc-nightly/+packages?field.name_filter=&field.status_filter=superseded&field.series_filter=jammy" | grep "20\.0.*0jammy" | grep -v "source.changes" | head -n 20 | sed 's/.*\(git[0-9]\+\.[0-9]\+-[0-9a-z]\+\).*/\1/'
 
#echo $versions
echo "Downgrade Kodi to previous nightly version. Showing the last 20 nightly releases:"
 
PS3='Please enter your choice: '
options=($versions "Quit")
select opt in "${options[@]}"
do
    case $opt in
        "Quit")
            break
            ;;
        *)
            wget "$url2/kodi_20.0+${opt}-0jammy_all.deb"
            wget "$url2/kodi-x11_20.0+${opt}-0jammy_amd64.deb"
            sudo dpkg -i kodi_20.0+${opt}-0jammy_all.deb kodi-x11_20.0+${opt}-0jammy_amd64.deb
            sudo service kodi stop
	    sudo service kodi start
	    break
	    ;;
    esac
done