Upgrading an outdated, end of life (EOL) Ubuntu version (in this case it was 22.10) to a recent one needs a special treatment. Running just apt dist-upgrade doesn't work, beforehand the apt source files need to be changed, because new packages cannot be retrieved from the old source urls …

• Download SNAP package and install it:
  • chmod +x esa-snap_sentinel_unix_9_0_0.sh
  • ./esa-snap_sentinel_unix_9_0_0.sh
  • Installation directory: ~/.snap
  • Symlink folder: ~/.local/bin ("Select the folder where you would like ESA SNAP to create symlinks, then click Next.")
  • Python path: /usr/bin/python3 ("Python executable")
• Install OpenJDK 8:
  • as documented on the ubuntuusers.de …