Package
Stable Diffusion WebUI Forge – Neo
When did the issue occur?
Installing the Package
What GPU / hardware type are you using?
NVIDIA GeForce RTX 3060 Driver 575.57.08 CUDA toolkit 12.0 CPU: AMD64 desktop RAM: 32GB
What happened?
Stability Matrix fails to install Forge‑Neo on Linux Ubuntu 24.04.4 LTS (Noble Numbat)
During installation, SM repeatedly attempts to install Python 3.13.12 using uv.
uv installs Python 3.13.12, but Stability Matrix cannot validate the installation:
UV listed Python at ...cpython-3.13.12... but PyInstallation.Exists() check failed.
Despite this failure, SM still uses Python 3.13.12 to create the venv:
Using Python 3.13.12 environment at: venv
Forge‑Neo then attempts to install torch under Python 3.13, which is unsupported by PyTorch, causing the installation to fail with exit code 1.
Console output
Unpacking resources
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Python 3.13.12 (main, Feb 3 2026)
Installing torch and torchvision
/bin/sh: 1: uv: not found
RuntimeError: Couldn't install torch.
Command: "/home/j/SD/Data/Packages/Stable Diffusion WebUI Forge - Neo/venv/bin/python3" -m pip install torch==2.11.0+cu130 torchvision==0.26.0+cu130 --extra-index-url https://download.pytorch.org/whl/cu130
Error code: 127
UV listed Python at /home/j/SD/Data/Assets/Python/cpython-3.13.12-linux-x86_64-gnu/bin as installed, but PyInstallation.Exists() check failed.
Python 3.13.12 not found. Attempting to install with UV.
Successfully installed Python 3.13.12 with UV
Using Python 3.13.12 environment at: venv
Install script failed with exit code 1
Version
2.15.7
What Operating System are you using?
Linux
Package
Stable Diffusion WebUI Forge – Neo
When did the issue occur?
Installing the Package
What GPU / hardware type are you using?
NVIDIA GeForce RTX 3060 Driver 575.57.08 CUDA toolkit 12.0 CPU: AMD64 desktop RAM: 32GB
What happened?
Stability Matrix fails to install Forge‑Neo on Linux Ubuntu 24.04.4 LTS (Noble Numbat)
During installation, SM repeatedly attempts to install Python 3.13.12 using uv.
uv installs Python 3.13.12, but Stability Matrix cannot validate the installation:
UV listed Python at ...cpython-3.13.12... but PyInstallation.Exists() check failed.
Despite this failure, SM still uses Python 3.13.12 to create the venv:
Using Python 3.13.12 environment at: venv
Forge‑Neo then attempts to install torch under Python 3.13, which is unsupported by PyTorch, causing the installation to fail with exit code 1.
Console output
Unpacking resources
Download Complete
Python 3.13.12 (main, Feb 3 2026)
Installing torch and torchvision
/bin/sh: 1: uv: not found
RuntimeError: Couldn't install torch.
Command: "/home/j/SD/Data/Packages/Stable Diffusion WebUI Forge - Neo/venv/bin/python3" -m pip install torch==2.11.0+cu130 torchvision==0.26.0+cu130 --extra-index-url https://download.pytorch.org/whl/cu130
Error code: 127
UV listed Python at /home/j/SD/Data/Assets/Python/cpython-3.13.12-linux-x86_64-gnu/bin as installed, but PyInstallation.Exists() check failed.
Python 3.13.12 not found. Attempting to install with UV.
Successfully installed Python 3.13.12 with UV
Using Python 3.13.12 environment at: venv
Install script failed with exit code 1
Version
2.15.7
What Operating System are you using?
Linux