Uninstall OS running in dual boot [duplicate]

Supposing I have two Linux distributions, in dual boot (the GRUB menu appears and ask me what to choose):

• Ubuntu 14.04
• elementary OS

Adding a new one is very simple: just insert the installation device and start installing.

What about uninstalling one? How can I uninstall elementary OS, for example?

Can I do that only by formatting/deleting that partition?

Solution 1:

You can use OS-Uninstaller

OS-Uninstaller is a small graphical tool to perform a clean and quick uninstall of any operating system (Windows, MacOS, Ubuntu, other Linux distribution..) of your computer. OS-Uninstaller is a free software, licenced under GNU-GPL. ^{OS-Uninstaller}