You add [arch=amd64] to the sources entries for that mirror,
it'll look something like
Code:
deb [arch=amd64] http://miktex,org/download/ubuntu/ bionic something
You'll need to see which entries need it in the sources.list file.
(Note, I used something as a generic reference as that last entry can be a number of different things such as main stable unstable testing, and so on,
you'll need to have whatever the entry you see for it is and not use something. So we're clear on that)
A quick guide and reference on how to about apt and sources:
https://help.ubuntu.com/community/Re...es/CommandLine
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