RooSimultaneous template fit

Hello,
I see this is an old topic. I am trying to revive it, since I cannot get working the examples - none of the versions at https://gist.github.com/kreczko/682dc542a9ae435ef630 works for me.
My aim is to use python with RooSimultaneous with histograms RooDataHist.
Everytime, every example, root v6.16 and v6.18, rootpy or just pyroot plain - I end up with a similar error

NotImplementedError: pair<_Rb_tree_iterator<pair<const string,TH1*> >,bool> map<string,TH1*>::insert<std::pair<std::__cxx11::basic_string<char>, TH1 *> >(pair<string,TH1*>&& __x) =>
    could not convert argument 1 (this method can not (yet) be called)

Which always points to te problem of this object and its method input()

m1=ROOT.std.map('string, TH1*')()
#import rootpy.stl as stl  #rootpy version
#MapStrRootPtr = stl.map(stl.string, "TH1*") # rootpy version

Is it due to my python installation? (Default ubuntu 1804 version : 3.6.8 , libs 3.6.7 )

C version works: Simultaneous RooDataHist (Map) combined with tutorials/rf501…C