whenever I do sudo apt-get update this output appear
$ sudo apt-get update
Hit:1 http://archive.raspberrypi.org/debian buster InRelease
Hit:2 http://raspbian.raspberrypi.org/raspbian buster InRelease
Reading package lists... Done
N: Skipping acquire of configured file 'main/binary-arm64/Packages' as repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file 'contrib/binary-arm64/Packages' as repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file 'non-free/binary-arm64/Packages' as repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file 'rpi/binary-arm64/Packages' as repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' doesn't support architecture 'arm64'
and it's so annoying that there are >N: Skipping acquire of configured file line, although these line are not affect the performance, I mean I can still update or upgrade packages or even install packages without problem.
so the question is, how can I remove those >N: Skipping acquire of configures file message
I had the same problem. I fixed it by entering the following command:
sudo dpkg --remove-architecture arm64
I suspect I may have added the arm64 architecture by mistake at some earlier time. The standard 32-bit Raspberry Pi OS (aka Raspbian) does not support 64-bit applications.