Howtoforge published a tutorial showing you how to install Vaultwarden with Docker on Ubuntu 22.04.
How to Install Vaultwarden with Docker on Ubuntu 22.04
Vaultwarden is an unofficial port of Bitwarden server written in Rust language. It is compatible with the official Bitwarden clients and is less resource-heavy than Bitwarden. It implements almost all features of Bitwarden barring a few. It uses the Bitwarden API to provide features like organization support, attachments, authenticator, U2F, Yubikey, Duo support, and support for email alias services.