How to fix a "Failed to fetch binary-armhf/Packages" error during apt-get update...

Question 1

When I run sudo apt-get update I get the following error:

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/main/binary-armhf/Packages  404  Not Found [IP: 91.189.91.15 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.

I've tried looking in /etc/apt/sources.list.d/ to see if anything in that directory can be removed but all that is in there is

nodesource.list
nodesource.list.save

In my sources.list file I have:

deb http://ports.ubuntu.com/ubuntu-ports/ trusty main
deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty main
deb http://ports.ubuntu.com/ubuntu-ports/ trusty-updates main
deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-updates main
deb http://ports.ubuntu.com/ubuntu-ports/ trusty-security main
deb-src http://ports.ubuntu.com/ubuntu-ports/ trusty-security main
deb http://archive.ubuntu.com/ubuntu trusty main
# deb-src http://archive.ubuntu.com/ubuntu trusty main

Can anyone recommend a way of fixing this error?

Question 2

You might install the armhf cross tools which add armhf as foreign architecture (your architecture maybe i386 or amd64). You can launch this command to verify:

dpkg --print-foreign-architectures

If the output includes armhf, you can simply remove it by running the command:

sudo dpkg --remove-architecture armhf

Finally, launch your sudo apt-get update again.