# Install the Debian Bullseye repo key first (this repo is "closest" to Ubuntu 22.04 "jammy")
wget https://enterprise.proxmox.com/debian/proxmox-release-bullseye.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bullseye.gpg
# Setup the PBS client repo
echo "deb [arch=amd64] http://download.proxmox.com/debian/pbs-client bullseye main" | sudo tee /etc/apt/sources.list.d/pbs-client.list
# Setup the LibSSL1.1 client repo from the Ubuntu "focal" security repo (apparently it's not yet available for "jammy")
echo "deb [arch=amd64] http://security.ubuntu.com/ubuntu focal-security main" | sudo tee /etc/apt/sources.list.d/focal-security.list
# Update repos and install PBS client
apt update && apt install -y proxmox-backup-client