I cannot install a custom app because of this error

[trentmu]

@Paul_Karugu

Command “python setup.py egg_info” failed with error code 1 in /home/frappe/frappe-bench/apps/fish_farm/

This (error code 1) is still a permissions error - but within python/pip. I can only suggest that you downgrade to pip v9.03 if your version is 10 or higher.

python -m pip install --user pip==9.0.3

There is some useful info here and tips here