The launcher uses the 'xdg-open' command to open
http URIs in the browser. Without this installed,
clicking links in the launcher will result in nothing
happening.
The Runescape launcher requires 1.1.x versions of openssl libs (specifically
libssl.so.1.1 and libcrypto.so.1.1). The default
openssl package being v3.x.y was too new
and caused the build to fail.