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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?

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

Faced same issue while working with jetson-tx2 arm64.
This manual refers the solution in advanced setup scenario
It turns out you can't remove architecture without removing packages.

This is useful when a foreign architecture has been added, causing "404 Not Found" errors to appear when the repository meta-data is updated.
For example, if you wanted to restrict a repository to only the amd64 and i386 architectures, it would look like:

deb [arch=amd64,i386] <url>

Provide the above option for all repositories in "sudo gedit /etc/apt/sources.list"

Now "sudo apt update" and it will fetch only from amd64 and i386.

The same happened to me. I was not able to apt update, nor to apt upgrade, because arm64 Package updates failed in 404 Error.

dpkg gave me the output:

$ dpkg --print-foreign-architectures

i386

arm64

Looking at my installed arm64 packages showed that there was some cross-compiling stuff installed by Jetpack:

$ dpkg -l | grep arm64

ii  cuda-cudart-cross-aarch64-9-0:arm64  9.0.252-1           arm64   CUDA Runtime cross-aarch64 dev links, headers

ii  libc6-arm64-cross                    2.23-0ubuntu3cross1 all     GNU C Library: Shared libraries (for cross-compiling)

ii  linux-libc-dev-arm64-cross           4.4.0-18.34cross1   all     Linux Kernel Headers for development (for cross-compiling)

...

My solution:

I just ran the Jetpack Uninstaller, which cleared all those cross-compiling packages as well as the arm64 architecture:

$ ./JetPack_Uninstaller

Afterwards I was able again to use apt properly.