Hello,
You know, you can install the roadiz package from the yunohost repo… then, can you provide log or something(you did only these command or more ?) because I don’t use standart-edition in the community package. It’s not a Yunohost problem… the themes on roadiz have nothing to do with yunohost, but it can be a bad configuration of roadiz or a problem of permissions in the folder(s).
frju365
(btw. Roadiz Package Post: Paquet Roadiz, un CMS moderne polymorphique )