Man pages matching name bio::db::gff::aggregator::ucsc_ensgene in section 3pm:

Bio::DB::GFF::Aggregator::ucsc_ensgene.3pm.en	debian 10 / libbio-perl-perl
Bio::DB::GFF::Aggregator::ucsc_ensgene.3pm.en	debian 11 / libbio-db-gff-perl
Bio::DB::GFF::Aggregator::ucsc_ensgene.3pm.en	debian 12 / libbio-db-gff-perl