So, I tried apt-get update and got several "no release file' errors. Reinstalling ca-certificates resolved the errors. I went on Debian IRC and was told this was due to repos using HTTPS and that I needed to install apt-transport-https.

It was suggested to just use HTTP since the security is already in the signed release files and HTTPS doesn't add any extra security.

Perhaps sudo apt install apt-transport-https should be added to the prerequisites command line on the Liquorix page?
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It probably should be added to the install directions, since most people are not aware that https apt requires that package.
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I've updated the Debian instructions to install apt-transport-https and add the repository key with curl + apt-key. Can you try again?
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In the description for apt-transport-https I get this:

This is a dummy transitional package - https support has been moved into
the apt package in 1.5. It can be safely removed.

Meanwhile I discovered that uninstalling some packages results in my certificates going missing, hence apt complaining. To completely get rid of the packages I was removing folders in /etc/, which incidentally contained some certificates. As it turns out, all certificates are indexed, and when those certificates go missing the whole index breaks. So the solution apparently is to do

sudo update-ca-certificates

This fixes my issues with sgfxi and apt errors.

Sorry about the wild goose chase.
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Apparently this is a bug with those packages:

github.com/jitsi/jitsi-meet/issues/2795#issuecomment-385221971
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