tutorial doesn't work anymore.
errors
Hit:8
https://cdn-aws.deb.debian.org/debian stretch Release
Fetched 14.9 kB in 8s (1,837 B/s)
Reading package lists... Done
W: GPG error:
http://archive.raspbian.org/raspbian jessie InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9165938D90FDDD2E
W: The repository '
http://archive.raspbian.org/raspbian jessie InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Skipping acquire of configured file 'main/binary-arm64/Packages' as repository '
http://archive.raspbian.org/raspbian jessie InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file 'contrib/binary-arm64/Packages' as repository '
http://archive.raspbian.org/raspbian jessie InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file 'non-free/binary-arm64/Packages' as repository '
http://archive.raspbian.org/raspbian jessie InRelease' doesn't support architecture 'arm64'
N: Skipping acquire of configured file 'rpi/binary-arm64/Packages' as repository '
http://archive.raspbian.org/raspbian jessie InRelease' doesn't support architecture 'arm64'