Man pages matching name bootup in section 7:

bootup.7.de	debian 10 / manpages-de
bootup.7.zh_CN	debian 10 / manpages-zh
bootup.7.zh_TW	debian 10 / manpages-zh
bootup.7.en	debian 10 / systemd
bootup.7.de	debian 11 / manpages-de
bootup.7.zh_CN	debian 11 / manpages-zh
bootup.7.zh_TW	debian 11 / manpages-zh
bootup.7.en	debian 11 / systemd
bootup.7.de	debian 12 / manpages-de
bootup.7.zh_CN	debian 12 / manpages-zh
bootup.7.zh_TW	debian 12 / manpages-zh
bootup.7.en	debian 12 / systemd