Frequently Asked Questions (FAQ)

Lucien
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Frequently Asked Questions (FAQ)

This post collects common questions and answers to help you quickly resolve issues and better understand how to use our platform.

:backhand_index_pointing_right: Please scroll through the replies below to see individual questions and answers.
:backhand_index_pointing_right: If your question isn’t listed, feel free to create a new topic in the appropriate category.

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How do I register a custom Jupyter kernel for Lucien?

Python Kernel

  1. Activate your Python virtual environment:

    source .venv/bin/activate

  2. Install ipykernel:

    pip install ipykernel

  3. Register your kernel with Jupyter:

    python -m ipykernel install --user --name=myenv --display-name="myenv"

R Kernel

  1. Install the IRkernel package in R

    install.packages("IRkernel", repos = "https://cloud.r-project.org")

  2. Register the R kernel with Jupyter

    IRkernel::installspec(name = "ir", displayname = "R (Standalone)")

Use jupyter kernelspec list to see available kernels.

4

Get a GTK error when launching Lucien in Linux.

If you see the following error when starting Lucien:

GTK 2/3 symbols detected. Using GTK 2/3 and GTK 4 in the same process is not supported

This means there is a conflict between GTK versions. To resolve this, run Lucien with the following flag to specify GTK 3 explicitly: lucien --gtk-version=3

5

Lucien doesn’t work on WSL2 with login

Lucien requires a browser to login. If you’re using WSL without a GUI, you need to install the browser first.

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How to Sign Up for Lucien?

  • Follow the steps here: Lucien Sign-Up Guide
  • Look for the “Account Confirmation” email.
  • If it’s not in your inbox, check your Spam/Junk folder.

Still can’t find it? Resend the verification email or contact the technical supports.

7

I see the error: PERM: operation not permitted: unlink.

image

Answer: This is a Windows-specific issue. The error happens because the old Conda environment directory cannot be properly cleaned up, which blocks the update.

You don’t have to do all steps below — trying just one of them is usually enough:

  1. Completely exit Lucien and kill all related processes.
  2. Manually delete the folder:
%USERPROFILE%\AppData\Roaming\Lucien\lucien-server
  1. Restart your computer to release file locks.