Memory collection fails without explanation

[mgg1776]

I've tried installing margaritashotgun on a stock marketplace Ubuntu Server 16.04 EC2 instance in AWS and VM in Azure, both as a regular installation and in a virtual environment.

In both I get the following when executing:

$ margaritashotgun --server <target_host_ip> --username <target_host_username> --key <path_to_private_key> --filename memdump.bin --output-dir . --log-dir . --module lime-4.4.0-1072-aws.ko 
2018-12-14T02:07:23 - margaritashotgun.client - INFO - 1 hosts processed. completed: 0 failed 1
2018-12-14T02:07:23 - margaritashotgun.client - INFO - completed_hosts: []
2018-12-14T02:07:23 - margaritashotgun.client - INFO - failed_hosts: ['<target_host_ip>']

The memory-capture.log file is empty in all occurrences of this error:

$ cat memory-capture.log 
[
]

Are there any other log files that might indicate what the problem is?

[mgg1776]

So it might be that I was installing margaritashotgun via python3 pip instead of python2 pip.

I did it again with python2 pip via a straight install (no virtual env), and it worked with the exception of the wrong python binary being referenced on the shebang line of

$ which python
/usr/bin/python

$ which margaritashotgun 
/home/ubuntu/.local/bin/margaritashotgun

$ cat /home/ubuntu/.local/bin/margaritashotgun | head -n 1
#!/usr/local/opt/python/bin/python2.7

I changed the shebang to my default system python2 binary and it worked.