Comment # 44 on bug 1227420 from Jarkko Torvinen

Ok, sounds reasonable.
Finnish(kotoistus) is actually now Finnish(official) in GUI. 
But both KDE and Gnome still have plain Finnish(fi) also there, which should
not be possible if I understood correctly? And its the first choice offered,
see previously attached aeon-gnome-initial-setup-keymap-dialog.png, also
attaching from KDE kde_add_kblayout.png.
I think this would all be fine if Finnish(fi) did not exist in GUI as an option
offered (since its not a valid layout), specially in the case of Aeon where it
leads breaking console keymap/systemd-vconsole-setup.service.