Hi poussin42 and community!
I have the same problem on my Oneplus 7T Pro with Oxygen 11.0.9.1 and Nethunter 2023.2. When trying to update Nethunter or terminal to 2023.3 I get the error failed to install due to a unknown problem ??
Is there a log somewhere to look at and to figure out where the problem lies ?
Hope someone is willing to help.

All the best to you all!