i too have this issue. Installed Ubuntu 18.04 then followed the minemeld-ansible instructions. it was working. i restarted the server and it stopped working. Minemeld-web Fatal.
[2019-10-31 09:33:18 +0000]  [ERROR] Exception in worker process
Traceback (most recent call last):
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 517, in spawn_worker
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/workers/ggevent.py", line 190, in init_process
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/workers/base.py", line 122, in init_process
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/workers/base.py", line 132, in load_wsgi
self.wsgi = self.app.wsgi()
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
self.callable = self.load()
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
File "/opt/minemeld/engine/0.9.64/local/lib/python2.7/site-packages/gunicorn/util.py", line 357, in import_app
File "/opt/minemeld/engine/core/minemeld/flask/main.py", line 3, in <module>
app = create_app()
File "/opt/minemeld/engine/core/minemeld/flask/__init__.py", line 67, in create_app
from . import metricsapi # noqa
File "/opt/minemeld/engine/core/minemeld/flask/metricsapi.py", line 19, in <module>
ImportError: librrd.so.4: cannot open shared object file: No such file or directory
what i dont get is that after installation it started and was working fine then rebooted and issue.
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