Для openSUSE Factory+GNOME Factory запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:Apps/openSUSE_Factory+GNOME_Factory/GNOME:Apps.repo
zypper refresh
zypper install gnote
Для openSUSE Factory запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:Apps/openSUSE_Factory/GNOME:Apps.repo
zypper refresh
zypper install gnote
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:Apps/15.5/GNOME:Apps.repo
zypper refresh
zypper install gnote
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/GNOME:Apps/15.4/GNOME:Apps.repo
zypper refresh
zypper install gnote