Documentation: instruct users to install LiberTEM ?! about ptychography HOT 4 CLOSED

Normally, LiberTEM should be installed automatically since it is a dependency of the ptychography40 package:

Was it missing on your system when you installed ptychography40?

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[...] I have issues since I am running python3.9 instead of 3.7 (I assume). I am currently downgrading debian "testing" back to "stable". Than I will give it another try.

Yes, Python 3.9 support is discussed in this issue: LiberTEM/LiberTEM#914 which is believed to be an upstream issue in CPython, see discussion here: dask/distributed#4168

For Debian, I would strongly suggest to use miniconda to create isolated virtual environments - then you are independent of the system Python interpreter. The problem is you can only install one version of system Python 3 at a time, so once testing or unstable updates the Python version, you have a problem. Sometimes, even minor upgrades break virtual environments. This doesn't happen with conda-created venvs. Downgrading to Debian stable could be painful, as I don't think that is officially supported.

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Ok. Downgrading is painful! However, I could manage to get back to Debian current "testing" distribution, aka bullseye.

I followed the above suggestion and installed miniconda and created a python-3.7 based environment there.

Now, imports are working fine, except for hyperspy requesting more recent packages. I obeyed this by installing hyperspy explicitly to pull the required package versions.

Libertem was installed automatically. The issue remains, but for this the current title is wrong. Will open a new issue and close this one here.

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