SOLVED: Installing Neo4j via tarball (https://neo4j.com/docs/operations-manual/current/installation/linux/tarball/#installation-linux-tarball) worked. The Neo4j Debian/Ubuntu instructions recommend tarball installation for recent OS version. Since Raspian/Raspberry Pi OS is based on Debian 10 (Buster), latest Raspberry Pi needs to be installed via tarball. I untarred in /opt with sudo and Neo4j 4.2.2 came up.