Shutter is an awesome screenshot tool for Linux. CloudApp is an awesome screenshot sharing tool, but it lacks a Linux client. This plugin tries to solve that problem.
Download CloudApp.pm and move it to the Shutter upload plugins directory, and make it executable.
On Ubuntu, that's:
cd /usr/share/shutter/resources/system/upload_plugins/upload
sudo mv ~/Downloads/CloudApp.pm .
sudo chown root:root CloudApp.pm
sudo chmod a+x CloudApp.pm
Restart Shutter. You can force plugin reinitialization by clearing the cache, like so:
shutter --clear_cache
Enter your CloudApp username/password in Edit->Preferences->Upload->CloudApp:
Take a Shutter screenshot as usual, and click export.
Wait for the image to upload, and copy the public URL.
That's it. Enjoy.