Thanks for taking your time to report this issue and help making Ubuntu
better.

I was unable to reproduce this issue, in fact I could install lib32z1
without problems on my 20.04 system. I have a couple of comments though.

>lib32z1 (https://packages.ubuntu.com/focal/lib32z1) depends on
libc6-i386 (>= 2.4)

Indeed.

>but the latest version of libc6-i386 I can find for Ubuntu is (..)
impish

So the first thing is that when installing packages on 20.04 it will look in 
its archives, not other releases. So it will find version 2.31-0ubuntu9.2 from 
focal-updates without looking at what is available in newer releases.
Also, keep in mind that the second number in (>= 2.4)  is 4 not 40. So 
2.31-0ubuntu9.2 should be more that enough to satisfy this requirement because 
31 > 4  :)

Despite all this I see that you still get an error message. Based on the
output from `apt policy` I thought this should work. What you can try is
`sudo apt update` to refresh the package list. If the problem still
persists, try to see if you can install libc6-i386 directly. You may get
either a more detailed error message or it will suggest to remove other
packages due to conflicts. Sometimes with unmet dependencies the problem
can be further down the dependency tree so it might take some drilling
to discover what the problem is, for instance if it is due to conflicts
with other installed packages.

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https://bugs.launchpad.net/bugs/1929125

Title:
  lib32z1 cannot be installed on ubuntu 20.04 LTS

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