Hi,
the problem is that Gnome GUI cannot add any input source and does not see Ukrainian keyboard layout. I was trying the flowing to reset user settings:
sudo rm -fr /etc/* /home/* /opt/* /var/* /usr/local/*
That allows me to select input layout (Ukrainian layout is present and can be selected) and set a new user. But I still cannot add any input sources via keyboard settings.
Current OS version: 43660 Latest server version: 43660 There are no updates available
sudo swupd repair
Did not helped.
P.S. Running settings from terminal gives the error:
GnomeDesktop[24061]: WARNING: Failed to load 'evdev' XKB layouts
This does the trick. thanks to @Kingfisher
gsettings set org.gnome.desktop.input-sources sources "[('xkb', 'us'), ('xkb', 'ua'), ('xkb', 'ru')]"