I gave up, coming here to hopefully get some insight on how to further debug this state. I'm on Moodle 3.7 and Ubuntu 18.04.
As per attachment, you can see, that Memcached is installed and running, but store is not ready and I dont get it why..
My memcached service is active and running.
Php extension is installed and enabled, double checked via php info.
I can telnet onto 127.0.0.1:11211.
Also, if I want to delete store instance, I get "You cannot delete this store because it has mappings. Please delete all mappings before deleting the store" but there is no mapping of this store anywhere..
What else can/must I check?