but if i install this package on my dev machine how can i garanty that in will be installed on the client machine
There are at least two options:
Document in your
README
how to get the dependencies installed.Ship that module alongside your application.
I would personally prefer the former because that would allow users to benefit from the system-wide installation on their Linux machine.
For instance, if a bug is fixed in that module, they could update it on your system without you shipping a new version, or messing themselves with the installation directory.
It ain't that bad in my opinion, and after all, you have the same situation with the Python dependency and the Qt library. Presumably, you also let your users know where they can obtain them if they have difficulties.