Problems installing pip3 modules on Lubuntu 16.04

[groovychap]

I'm using Lubuntu 16.04 LTS and attempting to learn Python.

The version of Python I'm using is 3.5.1, which comes installed by default.

I'm working through a book called 'Automate the Boring Stuff', which requires the installation of several modules.

I've installed most of them without difficulty, but there are four which are causing me problems.

When I enter:


sudo pip3 install imapclient

I get this (http://pastebin.com/vt6y2efw) error.

When I enter:


sudo pip3 install pyzmail

I get this (http://pastebin.com/bgKebc1A) error.

When I enter:


sudo pip3 install pillow

I get this (http://pastebin.com/7CNLQ5gU) error.

And when I enter:


sudo pip3 install pyautogui

I get this (http://pastebin.com/1bKA8Kg8) error.

Could you help me make sense of them?

[groovychap]

All of my error messages contained the text:


If executing pip with sudo, you may want sudo's -H flag.

I've tried using the -H flag whilst attempting to install all four modules, but with no success.

These are errors I received whilst using the -H flag: imapclient (http://pastebin.com/ehHZiWbu), pyzmail (http://pastebin.com/H02u9NWA), pillow (http://pastebin.com/huZvL7U7), pyautogui (http://pastebin.com/qc79FWzX)

I should mention that I also was unable to install these modules on Lubuntu 15.10, which suggests that this isn't a 16.04 problem.