Man pages matching name unimplemented in section 2:

unimplemented.2.de	debian 10 / manpages-de-dev
unimplemented.2.en	debian 10 / manpages-dev
unimplemented.2.es	debian 10 / manpages-es
unimplemented.2.it	debian 10 / manpages-it
unimplemented.2.ja	debian 10 / manpages-ja-dev
unimplemented.2.pl	debian 10 / manpages-pl-dev
unimplemented.2.pt	debian 10 / manpages-pt-dev
unimplemented.2.de	debian 11 / manpages-de-dev
unimplemented.2.en	debian 11 / manpages-dev
unimplemented.2.es	debian 11 / manpages-es-dev
unimplemented.2.fr	debian 11 / manpages-fr-dev
unimplemented.2.it	debian 11 / manpages-it-dev
unimplemented.2.ja	debian 11 / manpages-ja-dev
unimplemented.2.nl	debian 11 / manpages-nl-dev
unimplemented.2.pl	debian 11 / manpages-pl-dev
unimplemented.2.pt	debian 11 / manpages-pt-dev
unimplemented.2.cs	debian 12 / manpages-cs-dev
unimplemented.2.da	debian 12 / manpages-da-dev
unimplemented.2.de	debian 12 / manpages-de-dev
unimplemented.2.en	debian 12 / manpages-dev
unimplemented.2.es	debian 12 / manpages-es-dev
unimplemented.2.fr	debian 12 / manpages-fr-dev
unimplemented.2.it	debian 12 / manpages-it-dev
unimplemented.2.ja	debian 12 / manpages-ja-dev
unimplemented.2.nl	debian 12 / manpages-nl-dev
unimplemented.2.pl	debian 12 / manpages-pl-dev
unimplemented.2.ru	debian 12 / manpages-ru-dev
unimplemented.2.tr	debian 12 / manpages-tr