Easy and simple Linux triple-store

Hullo all,

Apologies if this is a stupid question.

I would like to know if there is any tech that would be the triple-store
equivalent to Sqlite? What I want is to create my only local graph based on
nodes in Wikidata and data I generate myself.

What technology do people use? Is there a recommended stack? I don't
necessarily mean something like Ruby on Rails which is convention over
configuration and "batteries included" by I don't mean Opengraph Virtuoso
either, that's way too heavyweight.

I'm running Ubuntu 17.10, a fairly popular distro. I can't seem to compile
Redstone and anyway it appears unmaintained. Cayley looks cool but doesn't
have its own on-disk back-end? (I don't understand that). Franz
Allegrograph seems too commercial and lispy (maybe I'm wrong about this.).
I don't want to use Jena because, um, Java.

I can't find a single simple tutorial about using ruby-rdf to write to,
modify, and query my own local triple-store.

Most of the time I think it would be easier to define a relational model
and map to triples on the fly and then I'd use tech that I'm familiar.

For small projects what do people use? I don't want to spend a week setting
up a local triple-store. I want something that is robust, I can set up
nearly as easily as Rails, is actively maintained, and supports most of the
current Semantic Web tech.

Is there something obvious I'm not getting or that I'm overlooking?

Thanks!
    Anthony