Indeed a basic detection for Linux Mint could be implemented, it would be great if you could post the output of the following VT (either here or privately via PN to me):
Name: OS Detection Consolidation and Reporting
OID: 1.3.6.1.4.1.25623.1.0.105937
Family: Product detection
as described in Call for info: Unknown OS and Service Banner Reporting
Note: Such an implementation would only introduce OS Detection for Linux Mint. There are no plans by Greenbone to support this Linux Distributions for package manager based authenticated scans, especially as it seems (only did a short research) that Linux Mint doesn’t publish any vendor advisories for their packages.