About the initial question on the missing GSA:
Looks like the gvm package (which is getting pulled in when installing the openvas package) on Ubuntu 22.04 is depending on a non-existent greenbone-security-assistant package:
This means that you will never get a working GSA installation by just using the packages provided by Ubuntu 22.04 directly (only the upcoming Ubuntu kinetic seems to provide the Ubuntu – Details of package gsad in kinetic replacement package) and not sure if you can compile the missing gsa and gsad on top of these manually.
Alternatives are:
- Docker as suggested previously
- Building the full GVM stack from source based on Building 22.4 from Source - Greenbone Community Documentation
- Using the Greenbone Enterprise TRIAL from Greenbone Enterprise TRIAL - Greenbone Networks