[Bug]: Torch is not able to use GPU during install

[gormenghast88]

Checklist

• The issue exists after disabling all extensions
• The issue exists on a clean installation of webui
• The issue is caused by an extension, but I believe it is caused by a bug in the webui
• The issue exists in the current version of the webui
• The issue has not been reported before recently
• The issue has been reported before but has not been fixed yet

What happened?

I am on linux and tried to install webui and get as far as:

./webui.sh

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Install script for stable-diffusion + Web UI
Tested on Debian 11 (Bullseye), Fedora 34+ and openSUSE Leap 15.4 or newer.
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Running on tux user
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Create and activate python venv
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Requirement already satisfied: pip in ./venv/lib/python3.10/site-packages (23.0.1)
Collecting pip
Using cached pip-26.0.1-py3-none-any.whl (1.8 MB)
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 23.0.1
Uninstalling pip-23.0.1:
Successfully uninstalled pip-23.0.1
Successfully installed pip-26.0.1
WARNING: There was an error checking the latest version of pip.

################################################################
Launching launch.py...
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glibc version is 2.39
Cannot locate TCMalloc. Do you have tcmalloc or google-perftool installed on your system? (improves CPU memory usage)
Python 3.10.20 (main, Apr 8 2026, 11:45:27) [GCC 13.3.0]
Version: v1.10.1
Commit hash: 82a973c
Installing torch and torchvision
Looking in indexes: https://pypi.org/simple, https://download.pytorch.org/whl/cu121
Collecting torch==2.1.2
Using cached https://download-r2.pytorch.org/whl/cu121/torch-2.1.2%2Bcu121-cp310-cp310-linux_x86_64.whl (2200.7 MB)
Collecting torchvision==0.16.2
Using cached https://download-r2.pytorch.org/whl/cu121/torchvision-0.16.2%2Bcu121-cp310-cp310-linux_x86_64.whl (6.8 MB)
Collecting filelock (from torch==2.1.2)
Using cached filelock-3.25.2-py3-none-any.whl.metadata (2.0 kB)
Collecting typing-extensions (from torch==2.1.2)
Using cached https://download.pytorch.org/whl/typing_extensions-4.15.0-py3-none-any.whl.metadata (3.3 kB)
Collecting sympy (from torch==2.1.2)
Using cached sympy-1.14.0-py3-none-any.whl.metadata (12 kB)
Collecting networkx (from torch==2.1.2)
Using cached networkx-3.4.2-py3-none-any.whl.metadata (6.3 kB)
Collecting jinja2 (from torch==2.1.2)
Using cached https://download.pytorch.org/whl/jinja2-3.1.6-py3-none-any.whl.metadata (2.9 kB)
Collecting fsspec (from torch==2.1.2)
Using cached fsspec-2026.3.0-py3-none-any.whl.metadata (10 kB)
Collecting triton==2.1.0 (from torch==2.1.2)
Using cached https://download-r2.pytorch.org/whl/triton-2.1.0-0-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.whl (89.2 MB)
Collecting numpy (from torchvision==0.16.2)
Using cached numpy-2.2.6-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (62 kB)
Collecting requests (from torchvision==0.16.2)
Using cached requests-2.33.1-py3-none-any.whl.metadata (4.8 kB)
Collecting pillow!=8.3.*,>=5.3.0 (from torchvision==0.16.2)
Using cached pillow-12.2.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl.metadata (8.8 kB)
Collecting MarkupSafe>=2.0 (from jinja2->torch==2.1.2)
Using cached https://download.pytorch.org/whl/markupsafe-3.0.3-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl.metadata (2.7 kB)
Collecting charset_normalizer<4,>=2 (from requests->torchvision==0.16.2)
Using cached charset_normalizer-3.4.7-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl.metadata (40 kB)
Collecting idna<4,>=2.5 (from requests->torchvision==0.16.2)
Using cached idna-3.11-py3-none-any.whl.metadata (8.4 kB)
Collecting urllib3<3,>=1.26 (from requests->torchvision==0.16.2)
Using cached urllib3-2.6.3-py3-none-any.whl.metadata (6.9 kB)
Collecting certifi>=2023.5.7 (from requests->torchvision==0.16.2)
Using cached certifi-2026.2.25-py3-none-any.whl.metadata (2.5 kB)
Collecting mpmath<1.4,>=1.1.0 (from sympy->torch==2.1.2)
Using cached mpmath-1.3.0-py3-none-any.whl.metadata (8.6 kB)
Using cached pillow-12.2.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl (7.1 MB)
Using cached filelock-3.25.2-py3-none-any.whl (26 kB)
Using cached fsspec-2026.3.0-py3-none-any.whl (202 kB)
Using cached https://download.pytorch.org/whl/jinja2-3.1.6-py3-none-any.whl (134 kB)
Using cached https://download.pytorch.org/whl/markupsafe-3.0.3-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl (20 kB)
Using cached networkx-3.4.2-py3-none-any.whl (1.7 MB)
Using cached numpy-2.2.6-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (16.8 MB)
Using cached requests-2.33.1-py3-none-any.whl (64 kB)
Using cached charset_normalizer-3.4.7-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl (216 kB)
Using cached idna-3.11-py3-none-any.whl (71 kB)
Using cached urllib3-2.6.3-py3-none-any.whl (131 kB)
Using cached certifi-2026.2.25-py3-none-any.whl (153 kB)
Using cached sympy-1.14.0-py3-none-any.whl (6.3 MB)
Using cached mpmath-1.3.0-py3-none-any.whl (536 kB)
Using cached https://download.pytorch.org/whl/typing_extensions-4.15.0-py3-none-any.whl (44 kB)
Installing collected packages: mpmath, urllib3, typing-extensions, sympy, pillow, numpy, networkx, MarkupSafe, idna, fsspec, filelock, charset_normalizer, certifi, triton, requests, jinja2, torch, torchvision
Successfully installed MarkupSafe-3.0.3 certifi-2026.2.25 charset_normalizer-3.4.7 filelock-3.25.2 fsspec-2026.3.0 idna-3.11 jinja2-3.1.6 mpmath-1.3.0 networkx-3.4.2 numpy-2.2.6 pillow-12.2.0 requests-2.33.1 sympy-1.14.0 torch-2.1.2+cu121 torchvision-0.16.2+cu121 triton-2.1.0 typing-extensions-4.15.0 urllib3-2.6.3
Traceback (most recent call last):
File "/home/tux/AI/stablediff/stable-diffusion-webui/launch.py", line 48, in
main()
File "/home/tux/AI/stablediff/stable-diffusion-webui/launch.py", line 39, in main
prepare_environment()
File "/home/tux/AI/stablediff/stable-diffusion-webui/modules/launch_utils.py", line 387, in prepare_environment
raise RuntimeError(
RuntimeError: Torch is not able to use GPU; add --skip-torch-cuda-test to COMMANDLINE_ARGS variable to disable this check

I tried adding export COMMANDLINE_ARGS="--skip-torch-cuda-test" so webui_user.sh but still get same error. I am running a NVIDIA GeForce RTX 4070 Laptop GPU with updated CUDA cores so shouldn't get it. Tried deleting venv and running again still stops. I do not have venv/Scripts so cannot run the command it says in the troubleshooting guide.

Steps to reproduce the problem

Install as per README

What should have happened?

Should have installled

What browsers do you use to access the UI ?

No response

Sysinfo

NA

Console logs

NA

Additional information

No response