Issues with arm packages

Im running jetpack 3.2, executed “sudo apt-get update” runs fine up to a point, but ultimatly hits this:

Ign:22 http://ubuntu.mirror.cambrium.nl/ubuntu xenial/main arm64 Packages    
Ign:28 http://ubuntu.mirror.cambrium.nl/ubuntu xenial/universe arm64 Packages
Ign:22 http://ubuntu.mirror.cambrium.nl/ubuntu xenial/main arm64 Packages
Ign:28 http://ubuntu.mirror.cambrium.nl/ubuntu xenial/universe arm64 Packages
Err:22 http://ubuntu.mirror.cambrium.nl/ubuntu xenial/main arm64 Packages
  404  Not Found [IP: 217.19.16.188 80]
Ign:28 http://ubuntu.mirror.cambrium.nl/ubuntu xenial/universe arm64 Packages
Fetched 2,797 kB in 4s (604 kB/s)    
Reading package lists... Done
E: Failed to fetch http://ubuntu.mirror.cambrium.nl/ubuntu/dists/xenial/main/binary-arm64/Packages  404  Not Found [IP: 217.19.16.188 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

So, what are the correct repos, I assume I have to change bits in /etc/apt/sources.list, is there anything else? Im trying to install ‘libwxgtk2.8-0’.

Sorry if this is basic, Im still new to linux

I think it is correct to change sources.list.
https://help.ubuntu.com/community/Repositories/CommandLine

217.19.16.188 looks alive from my side. Could you try it again?