Yes, it's the original Samba, not Samba4.

I have a feeling that if I remove gadmin-samba all my shares will be
gone since they are defined by it in smb.conf. Nevertheless I will try
it and let you know.There is a sharing option in the properties of
files/folders in Kubuntu. That would still work but it wouldn't be as
neat as centralized administration from the gadmin console.