I've noticed the same with Ubuntu 14.04. I discovered it because my neighbor's mobile device name suddenly appeared in my network applet. Tested it with my own Android mobile and tablet (all running standard Android). Ubuntu is running on my Lenovo E530c. Also when I run the Ubuntu 14.04 live cd (from USB). I'm able to connect without requiring a pin to pair the devices.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to indicator-bluetooth in Ubuntu. https://bugs.launchpad.net/bugs/1300915 Title: bluetooth pairing does not require a pin Status in “indicator-bluetooth” package in Ubuntu: Confirmed Bug description: click on bluetooth desktop applet, turn on "visible" on nexus 4 go to settings > bluetooth click on ubuntu-0 under "available devices" pairing succeeds without asking for a pin or authentication from Ubuntu! ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: indicator-bluetooth 0.0.6+14.04.20140207-0ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7 Uname: Linux 3.13.0-20-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.14-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Tue Apr 1 18:41:07 2014 InstallationDate: Installed on 2014-03-27 (5 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326) SourcePackage: indicator-bluetooth UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/indicator-bluetooth/+bug/1300915/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp