I enabled bluetooth on my laptop having Ubuntu 13.04 & also on my Asus fonepad7 tablet. I tried to access my tablet from laptop but couldn't do. I went to "setup new device" on my laptop using bluetooth icon. There I selected my tablet. It messaged as shown in the attachment file name 'bluetooth_1'.
In laptop, when I selected "send files to device" under bluetooth icon, I successfully transferred a file from laptop to tablet. But in laptop, under bluetooth icon, if I select "browse files on device", then it fails as shown in the attachment file name 'bluetooth_2'.
(Please note I have to post the screen shots via attachments as the option for embedding images isn't there in this forum which earlier was there)

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Sending a file to a device via Bluetooth is done with Object Push Profile (OPP), while browsing for files is done with OBEX. These are two very different protocols, and Android only supports OPP out of the box. That means you can send and receive files from stock Android, but you can't browse the filesystem.

You'll need to download an OBEX application from the Play Store if you want to browse the Android device's filesystem over Bluetooth. I've always had good results with Bluetooth File Transfer from Medieval Software.