I don't think you did all that. You probably did _not_ source the file /mnt/us/python/pythonenv - or you installed to another location. That LD_LIBRARY_PATH environment setting in there is mandatory and the culprit in the case of the error you are facing.
Note that _sourcing_ it is needed, not executing it as a shell script (which would only affect a subshell). "source /mnt/us/python/pythonenv".