ELK 5.3.2 with X-Pack - don't have "Monitoring" menu in Kibana

I don't see "Monitoring" menu in Kibana at all.
I added "xpack.monitoring.enabled: true" into Kibana/Elastic configs, I do see monitoring indices
green open .monitoring-data-2 E25MaWstS_KsKn7m2Fp3iw 1 0 2 0 4kb 4kb
green open .monitoring-es-2-2017.05.04 3iDodJbQTTmGKlsEtHbAZg 1 0 358 6 258.6kb 258.6kb

But "Monitoring" tab is missing from the menu.

Any ideas?

TIA, Vitaly

Did you restart KB?

Yes, restarted Kibana; and I don't see something relevant in its logs.

And you installed X-Pack in KB too?

Yes:
/usr/share/kibana/bin/kibana-plugin list
x-pack@5.3.2

May be clean the browser cache?

Oops! The same stupid ownership issue as with Elactic.
After
chown -R kibana /usr/share/kibana/plugins/x-pack
chown -R kibana /usr/share/kibana/optimize/

and restarting Kibana I have Monitoring/Graphs menus.

Weird that it was nothing into logs. And in general, it's not an issues that I'll expect from enterprise software...

Mark, many thanks!

That is not standard behaviour.
Can you replicate it?

It was "fresh" CIS-hardened Ubuntu 14.04 image. I don't have another Ubuntu instance for testing right now, but i'm pretty sure that these issues are reproducible (I mean this one and https://github.com/elastic/elasticsearch/issues/24480).