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According to Lorenzo's article, Pushbullet Indicator should work properly not only with Unity, but also with the KDE, LXDE and Xfce Ubuntu flavors.

Right now, Pushbullet Indicator supports sending notes, links, files, lists and addresses from your desktop to your Android or iOS device but it currently doesn't work the other way around: you can't push anything from your mobile device to your desktop (unless you have the Pushbullet Firefox or Chrome extensions installed, obviously). 

Another Pushbullet feature that's not yet supported in the indicator is displaying Android notifications on your desktop (the API doesn't allow this yet).

Update 16 July, 2014: Pushbullet Indicator now supports OAuth, notification mirroring from Android devices to your desktop and sending files from mobile devices to the desktop.

sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install pushbullet-indicator

1. Create a Pushbullet account, install the Pushbullet iOS / Android application (you can find the Android / iOS app links at the bottom of the Pushbullet main page) and setup Pushbullet on your mobile device - login, etc.

2. Start the PushBullet Indicator ap, authenticate it with Pushbullet and enter a name for your device.

If you want the indicator to start automatically when you log in, enable "Autostart" from its preferences (here you can also set the indicator icon to light/dark).

Then click OK.

If you've followed all the steps correctly, your mobile device(s) that have Pushbullet installed should show up in the Pushbullet Indicator menu, like this:

If there's no device listed here, make sure Pushbullet is installed on your mobile device(s) and that you're logged in, then restart the PushBullet AppIndicator (select Exit from the indicator menu, then start it again from the menu / Dash).

That's it, you can now start using Pushbullet. To send a file/text/link/etc. from Ubuntu to your Android or iOS device using Pushbullet Indicator, select the device from the indicator menu, then click the appropriate tab: message, link, file, list or address: