Quick script to open a file's parent folder in the file manager in ubuntu. #Install to ~/.config/sublime-text-3/Packages/User/

Default (Linux).sublime-keymap

[
    { "keys": ["ctrl+shift+e"], "command": "open_folder_in_nautilus" }
]

OpenInNautilus.py

import sublime, sublime_plugin, os, subprocess

class OpenFolderInNautilusCommand(sublime_plugin.TextCommand):
    def run(self, edit):
        if self.view.file_name():
            folder_name, file_name = os.path.split(self.view.file_name())
            self.view.window().run_command('exec', {'cmd': ['nautilus ' + folder_name], 'shell':True} )