How to change the language in which official Ubuntu documentation (online) is displayed?

Solution 1:

As of 2017-10-12, there is no nice way via the user interface. There is a bug report asking for a way, bug #1532537. Please add yourself to the list of affected people.

WORKAROUND

You can call the webpage with the language of your choice by appending .<language code> to the URL. Examples:

• https://help.ubuntu.com/stable/ubuntu-help/index.html.en
• https://help.ubuntu.com/stable/ubuntu-help/index.html.fr
• https://help.ubuntu.com/stable/ubuntu-help/index.html.de

Solution 2:

• As workaround, Firefox have a nice addon that let switch locale quickly.

  Quick Accept-Language Switcher by Dan Callahan

  Provides a quick way of changing the HTTP Accept-Language header so you can view and test websites with a different locale.

  

• Another one which seems better as you can set it permanently per site basis.

  HeaderControlRevived by Torvin

  Provides control over HTTP headers (User-Agent, Referer and Accept-Language) on a per-site basis.