Ubuntu chromium and web ide

That's odd - once you've enabled chrome://flags/#enable-experimental-web-­platform-features it'll usually 'just work' (http://www.espruino.com/Quick+Start+BLE#linux)

Have you tried just restarting the whole system and seeing if that's any better?

I use Linux for all my work, and occasionally I do get a Bluetooth adapter not available. and can fix it just by restarting the bluetooth stack with sudo /etc/init.d/bluetooth restart

What's your bluetoothd version? bluetoothd --version

And also what's the version of Chromium? Sometimes the builds are a long way behind the Chrome builds, so you could try installing Chrome and seeing if that's any better.