Armory Ubuntu/Debian 0.96.0 signed with a different key than listed on the website
https://bitcoinarmory.com is no longer Armory's official website. The official website is actually https://btcarmory.com. bitcoinarmory.com still hosts the new binaries, but they are only a mirror and everything else on the site is outdated.

Since Armory's development changed a few years ago, the actual release signing key is 4922589A as that is the new maintainer's signing key. This key is used on Armory 0.94.0 and above. The old signing key, 98832223, is the old maintainer's signing key.