At the time of the last Lintian run, the following possible problems were found in packages maintained by Gunter Königsmann <firstname.lastname@example.org>, listed by source package. See also the full report, including info, experimental and overridden tags. Also see their QA overview.
wxmaxima (19.07.0-1.1) §
- data/io.github.wxmaxima_developers.wxMaxima.appdata.xml (cc0-1.0 != gpl-2)