Dear maintainer, i have the same problem. - i tried to replace the tomcat-jars from the official distribution but that didn’t work - another class missing error appears.
The missing class org.apache.tomcat.util.modeler.modules.MbeansDescriptorsIntrospectionSource is in the file tomcat-coyote.jar of the official distribution but not in the packaged jars. The file MbeansDescriptorsIntrospectionSource is also in the debian-package-git-repo but it somehow doesn’t get built or packaged. The package is currently broken, so please consider upgrading the bug priority to grave. Please help!