It sounds like the problem is trying to open the local help custom UI, instead of the expected behaviour (opening the local HTML help in a browser). The debs produced by TDF do open the help in a browser, so there is a functional discrepancy here that should be investigated.
It sounds like the problem is trying to open the local help custom UI, instead of the expected behaviour (opening the local HTML help in a browser). The debs produced by TDF do open the help in a browser, so there is a functional discrepancy here that should be investigated.