Mirrored focal-updates repository not seen by apt

[Sam Varshavchik]

Oliver Grawert writes:

> hi,
> Am Mittwoch, dem 09.03.2022 um 18:59 -0500 schrieb Sam Varshavchik:
>
> you will also need:
>
> deb http://mirror.math.princeton.edu/pub/ubuntu focal main restricted
> universe multiverse
>
> if any package in focal-updates|-security|-backports changes its
> dependencies or if you install a package from these pockets and not all
> dependencies are locally installed yet, you need access to the main
> focal repo.

I still have

deb http://us.archive.ubuntu.com/ubuntu/ focal main restricted

in my sources.list, which should have this possibility covered?

And irrespective of dependency issues, shouldn't I still be able to just  
query an individual package's data, with apt-cache? I'm not seeing it. I can  
find it in the mirrored Packages.

Perhaps my problem is that at the very end of "apt-get update", I get this:

Reading package lists... Done
E: Failed to fetch file:/var/spool/apt- 
mirror/mirror/mirror.math.princeton.edu/pub/ubuntu/dists/focal- 
security/main/dep11/icons-64x64 at 2.tar  File not found - /var/spool/apt- 
mirror/mirror/mirror.math.princeton.edu/pub/ubuntu/dists/focal- 
security/main/dep11/icons-64x64 at 2.tar (2: No such file or directory)
E: Failed to fetch file:/var/spool/apt- 
mirror/mirror/mirror.math.princeton.edu/pub/ubuntu/dists/focal- 
updates/main/dep11/icons-64x64 at 2.tar  File not found - /var/spool/apt- 
mirror/mirror/mirror.math.princeton.edu/pub/ubuntu/dists/focal- 
updates/main/dep11/icons-64x64 at 2.tar (2: No such file or directory)
E: Failed to fetch file:/var/spool/apt- 
mirror/mirror/mirror.math.princeton.edu/pub/ubuntu/dists/focal- 
backports/main/dep11/icons-64x64 at 2.tar  File not found - /var/spool/apt- 
mirror/mirror/mirror.math.princeton.edu/pub/ubuntu/dists/focal- 
backports/main/dep11/icons-64x64 at 2.tar (2: No such file or directory)
E: Some index files failed to download. They have been ignored, or old ones  
used instead.

I have a sneaky feeling that this results in apt-get throwing away  
everything from my local mirror. This doesn't seem to be a transient  
mirroring issue, I've been getting this for a few days now, while tinkering  
with this. I don't see the reason for this. From where I'm sitting,

http://us.archive.ubuntu.com/ubuntu/dists/focal-updates/main/dep11/

and

http://mirror.math.princeton.edu/pub/ubuntu/dists/focal-updates/main/dep11/

look exactly the same to me. Neither one of them has a "icons-64x64 at 2.tar"  
that apt-get wants to open.

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