correction:
"Architecture: amd64" needs to be "Architectures: amd64"
(https://manpages.ubuntu.com/manpages/focal/man5/sources.list.5.html)
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with "apt modernize-sources" you can convert .list to .sources.
please also add "Architecture: amd64" to .sources file,
to replace "arch=amd64" in old .list files.
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apt modernize-sources
The following files need modernizing:
- /etc/apt/sources.li