Qian1
March 2, 2026, 8:29am
1
(base) C:\Users\小明>conda create --prefix D:\Anaconda3\envs\pytorch_env python=3.10
PackagesNotFoundError: The following packages are not available from current channels:
Hi — thanks for reporting this.
The PackagesNotFoundError for python=3.10 is almost certainly a channel issue, since multiple versions of Python 3.10 are definitely available on our defaults channel for win-64.
A couple of things to check:
Could you share the output of conda config --show channels and conda config --show default_channels? That will help us see your full channel setup. It looks like you’re using Tsinghua mirrors, and sometimes those mirrors have been filtered which can cause resolution failures like this.
As a quick test, try creating the environment with our channel explicitly:
conda create --prefix D:\Anaconda3\envs\pytorch_env python=3.10 -c https://repo.anaconda.com/pkgs/main/
If that works, the issue is with one of your configured mirror channels. If it fails with a connection error, that likely means there’s a network restriction between you and repo.anaconda.com, and we can help troubleshoot from there.
You can also run conda search python to see which versions of Python are available across all of your configured channels. That can help pinpoint where the gap is.
Also worth flagging that this could be related to issues that are currently being investigated related to anaconda.org .
You can keep up with status on Anaconda Status - Increased error rate on anaconda.org
Qian1
March 4, 2026, 3:47am
4
Thank you very much for replying. The result is as below, maybe there is something wrong in connection with repo.anaconda.com . And I wonder if I can download Python through my configured channels. Looking forward to your suggestions.
(base) C:\Users\魏倩>conda search python
python 2.7.12 0 anaconda/cloud/conda-forge
Thanks for sharing those details — this helps narrow things down.
Before we go further, could you run this:
conda search python=3.10
Your earlier conda search python output was cut off by the forum text limit, so we couldn’t see whether Python 3.10 is available from your configured channels. Filtering to python=3.10 will keep the output short enough to post here.
If that returns results , it means Python 3.10 is available from your channels but something in the solver is preventing it from being installed. We can troubleshoot from there.
If that returns no results , it means none of your currently configured channels are serving Python 3.10. In that case, try this:
conda create --prefix D:\Anaconda3\envs\pytorch_env python=3.10 -c https://repo.anaconda.com/pkgs/main/ --override-channels
A note on why this is different from what you tried before: when you used the -c flag on its own, it added repo.anaconda.com/pkgs/main to your existing channels but didn’t remove them. That’s why you still saw all of the Tsinghua mirrors in the channel list. The --override-channels flag tells conda to ignore your configured channels entirely and only use the one you specify. This lets us test whether repo.anaconda.com is reachable from your network and whether Python 3.10 can be installed from it directly.
Also — are you required to use the Tsinghua mirrors due to network restrictions? If your network blocks access to repo.anaconda.com, the above command won’t work, and we’d need to focus on why the mirrors aren’t serving Python 3.10 instead. This would likely need to include the team that owns the mirroring process.
Qian1
March 5, 2026, 4:46am
6
Thank you very much! I got result as below, what can I do? And I don’t need to use Tsinghua channels necessarily.I use the original Anaconda’s channels and it didn‘t work. So I change the channels to solve it, but they both didn‘t work and show Solving environment: failed. Thank you very much for help!
(base) C:\Users\魏倩>conda search python=3.10
python 3.10.0 h96c0403_3 anaconda/pkgs/main
(base) C:\Users\魏倩>
Python 3.10 is definitely available from your channels, so the issue isn’t with missing packages.
The PackagesNotFoundError you saw earlier is very odd behavior given than the packages are available through conda search. Given we have not been able to reproduce this, diagnosing the issue further is going to require some more detailed back-and-forth that’s better suited to a support ticket or a github issue than our forum.
If you are a current customer, I’d recommend opening a ticket with our support team at https://support.anaconda.com/ — include the output of conda info and the full error from your original conda create command. That will let the support team work through the issue directly with you.
You can also file an issue on the conda GitHub project at https://github.com/conda/conda/issues regardless of whether you are a customer or not. The same detail would be helpful there for the team to diagnose.
