@paulromano Thanks! Yes, I get the same thing… I even tried to install a virtual machine with Ubunto 22.04 OS, and it got me the same thing.
PS: 6 months ago, I successfully installed OpenMc and it worked with Jupyterlab notebook. For some reason I deleted it, and now I just can’t install it again.
I had this exact same problem last week, it was extremely weird. I think it was related to me having just changed over to mambaforge from anaconda. I ended up deleting every single conda folder/file on my machine (including the .condarc file) and completely reinstalling anaconda (instead of mambaforge). Then all the packages were found just fine. I have no idea what the cause was either but all the fixes I found via google did nothing to help it. Reinstalling everything worked though.
@kkiesling I did clean the whole machine from every single conda folder/file " and then I typed rm .zshrc, and set it back to the default zsh configuration. However, the problem was there.
When I cleaned everything again and installed Anaconda version “x86_64” rather than “arm64” it just worked.
Oh I forgot that also was part of my solution. Yes for some reason the arm64 anaconda version also couldn’t find it and it was fine with the x86_64 install. Very weird behavior.