Dependency error installing library that uses cudatoolkit

[networks1]

Trying to install NewsSentiment[cuda] on Ubuntu in a fresh mamba environment with Python 3.8. This yields an error

newssentiment[cuda] 1.1.25 depends on cudatoolkit==10.1; extra == "cuda"

which repeats through versions down to newssentiment[cuda] 1.0.0. If I install cudatoolkit 10.1 using conda, I get the same errors.

I reported the issue over there, asking the dev if he's certain the cuda support is working. He said "Yep, cudatoolkit should be working fine. looks like an error related to cudatoolkit, so ill suggest to open an issue over there."

So that's what I'm doing. Any idea how to fix?