i386 architecture is not supported

[paolantoni]

It's usual to find Ubuntu server with multiple architectures installed but docker does not support it.
In case of multiple architectures are enabled on the server the production deploy will fail.

---

changed: false
module_stderr: |
Traceback (most recent call last):
File "/tmp/ansible_WZuk1q/ansible_module_apt_repository.py", line 551, in
main()
File "/tmp/ansible_WZuk1q/ansible_module_apt_repository.py", line 543, in main
cache.update()
File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 473, in update
raise FetchFailedException(e)
apt.cache.FetchFailedException: W:Failed to fetch https://download.docker.com/linux/ubuntu/dists/trusty/InRelease Unable to find expected entry 'stable/binary-i386/Packages' in Release file (Wrong sources.list entry or malformed file)
, E:Some index files failed to download. They have been ignored, or old ones used instead.
module_stdout: ""
msg: "MODULE FAILURE"
rc: 1

Solved removing i386 support:
udo dpkg --remove-architecture i386 && sudo apt-cache clean && sudo apt-get update