[Mne_analysis] CondaEnvException: Pip failed

[bruno.de at ovgu.de]

        External Email - Use Caution        

Dear MNE-group members,

I'm trying to install MNE on my ubuntu virtual machine. I follow the  
installation instructions, namely: I open a new python 3 console in  
jupyter lab and type down the two commands:

1: curl --remote-name  
https://secure-web.cisco.com/1wWv0BqqY6t_2pkA7dCjMMD4DSvFTc8i_Q7PeI1qxobHlflTJ51EPDQbsa5xAVTbpo2zYNx4KT_wZ-yc9-HKDVjEpe84QOdJ-Fh0OlqCG2IRwi-x-H6u8lZaNn45yjBsoWcZeC3F5-CdAlUG-bZBBUU4WRXNibapfPIM2BRipFdEA1oNRwuUZpBF4-j2V84cEda5pfJA1FAWq3cxdT_r8uQ/https%3A%2F%2Fraw.githubusercontent.com%2Fmne-tools%2Fmne-python%2Fmaster%2Fenvironment.yml

2: conda env update --file environment.yml

The output of "conda env update --file environment.yml" ends with the  
following error message:

----------------------------------------
ERROR: Command errored out with exit status -6:  
/home/ubuntu/anaconda3/envs/mne/bin/python -u -c 'import sys,  
setuptools, tokenize; sys.argv[0] =  
'"'"'/tmp/pip-install-rs4nkvb8/mayavi/setup.py'"'"';  
__file__='"'"'/tmp/pip-install-rs4nkvb8/mayavi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-4of1zyxl/install-record.txt --single-version-externally-managed --compile --install-headers /home/ubuntu/anaconda3/envs/mne/include/python3.8/mayavi Check the logs for full command  
output.

failed

CondaEnvException: Pip failed

Does anyone know what could be causing this error message? I would  
appreciate any help

Best regards,

Bruno