I don't normally recommend commercial software, at least that doesn't work on a freemium subscription method, but I have to say... Insync works. And works really well. (Even on the Raspberry Pi!)
If you're reading this, there's a pretty high chance that you use Google Drive, and a relatively decent chance you use Linux. Unfortunately, Google in its infinite confusion hasn't yet seen fit to provide the world with a native Linux client for Google Drive (despite using Linux heavily in-house, and basing Chrome OS on Linux), leading to a number of posts with the #drive4linux and #driveforlinux hastags. There are a number of third-party solutions out there (including some open-source options), most of which I've tried with varying degrees of satisfaction. Insync, so far, is the best of them by a wide margin.
It's cross-platform, fast, and has some really nice options while remaining effortless to use. The downside? It's not free. On the upside, the basic personal version is only a one-time $20 purchase, which is well worth it if, like me, you use both Google Drive and Linux.
And it's almost freemium software. Insync offers a 15-day free trial that can be extended by an additional 15 days if you refer others (and you get it for free if you refer 10 people). So yeah, I'm being a bit selfish here, and trying to get you to click on the link and try the software, but only because the software is actually really good. I'll have no problem paying for Insync once my free trial ends.
But I'd still appreciate you trying it out so maybe I don't have to.