How to Remove arm64 Architecture in apt on Ubuntu 16.04

16.04aptnvidia

W: Invalid 'Date' entry in Release file /var/lib/apt/lists/_var_cuda-repo-8-0-local_Release
N: Skipping acquire of configured file 'non-free/binary-arm64/Packages' as repository 'http://repository.spotify.com stable InRelease' doesn't support architecture 'arm64'
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/main/binary-arm64/Packages  404  Not Found [IP: 91.189.88.161 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-arm64/Packages  404  Not Found [IP: 91.189.88.161 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-arm64/Packages  404  Not Found [IP: 91.189.88.161 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-security/main/binary-arm64/Packages  404  Not Found [IP: 91.189.88.161 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

After I installed Jetpack for Jetson tx1, my ubuntu constantly tries to fetch arm updates. Is there a way to disable this?

EDIT: 

$dpkg --print-architecture
amd64

$dpkg --print-foreign-architectures
i386
arm64

I see that arm64 is included in foreign architectures. How do I remove it?

Best Answer

You can remove a foreign architecture by running 

sudo dpkg --remove-architecture arm64

After that, you need to update your software lists. 

sudo apt update

If you still get some errors or warnings, you can try deleting all your software lists and completely re-downloading them from the server, to make sure nothing old is left. Note that the complete download will take a bit longer than usual:

sudo rm -rf /var/lib/apt/lists
sudo apt update
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