Sunflower is a twin pane, highly configurable, powerful and easy to use File Manager created for Linux with plugins support. It works with all desktop environments such as Gnome, Unity, KDE, Lxde, Xfce, Cinnamon, Mate, and others. It is open-source and developed using Python language, currently it is in active development and releasing stable versions, if you like this project then don't forget to contribute this project in anyway you like.
It offers two windows that implement an unusual concept by trying to integrate the command line with the file manager. The control concept is different from its competitors, as well: The Sunflower file manager makes intensive use of the keyboard.

Dual Pane: Unlike other file managers, Sunflower offers twin panel for easy access and use. Navigation is much easier than other file managers.

Dual panes can be displayed horizontally

Create Documents Easily: Creating files with this file manager is easy and with new options like "open file in editor". There is Advance options available to set permissions to file.

Copy/Move Dialog box with details: It shows complete details of file and folder copy/move/merge operation.

Terminal in File Manager: Another great feature of this File Manager is native Terminal, for easy access open Terminal in other panel either first or second. Sunflower Terminal offers almost same features like default Ubuntu Terminal.

Shortcut Keys for Sunflower File Manager

General Shortcuts

Keyboard Shortcut Function
Ctrl + Z Open Terminal
Ctrl + D Bookmark current directory
Ctrl + T Duplicate current tab
Ctrl + B Edit bookmark
Ctrl + Shift + T Open directory in new tab
Ctrl + W Close current tab
Ctrl + Tab Activate next Tab
Ctrl + Shift + Tab Change to the previous Tab
Ctrl + R Update pane
Backspace Change to the parent directory
Alt + Left arrow Go back in history
Ctrl + Backspace Show history
Esc Close history
Alt + letter Quick search
Alt + number Switch to bookmark
Menu or Shift + F10 Display menu
Ctrl + Menu Open with menu
Ctrl + Left arrow or Ctrl+Right arrow Use path from opposite panel
Alt + F3 Toggle preview function
F4 Text editor
Enter Apply default action to selected files
Ctrl + Enter Open current path in new tab
Ctrl + Alt + P View options
F11 Switch to full-screen mode
Ctrl + Q Quit Sunflower

File Operation Shortcuts

Keyboard ShortcutFunction
Ctrl + A Select all files
F8 or Delete Delete selection
Num + * Invert selection
Num + + Select by pattern
Num + - Unselect by pattern
F5 Copy selection
F6 Move selection
Ctrl + C Copy selected files to the clipboard
Ctrl + X Move selected files to the clipboard
Ctrl + V Paste from clipboard
Alt + Num + + Select by same extension
Alt + Num + - Unselect by (same) extension
Ctrl + F1 Bookmark for left pane
Ctrl + F2 Bookmark for right pane
F7 Create directory
Ctrl + F7 Create empty file
Ctrl + H Hide/Show hidden files
F12 Compare directories

Available for Ubuntu 16.04 Xenial/15.10 Wily/14.04 Trusty/12.04 Precise/Linux Mint 18/17/13/and other Ubuntu derivatives via atareao PPA
To install Sunflower in Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:

That's it.
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