For the privileged/unprivileged issue mentioned in comment #6, these upstream 
comments appears to be pertinent, suggesting patches that may be worth 
backporting:
  https://github.com/moby/moby/issues/40734#issuecomment-614259072
  https://github.com/moby/moby/issues/40734#issuecomment-680250761

As to the gpg errors in comment #8, I suspect those are unrelated.
Those types of errors can crop up for a wide variety of reasons,
including insufficient disk space, networking glitches, gpg problems,
etc. all mostly unrelated to the package itself, so I would suggest
looking to regular support channels for help there, for example see
https://superuser.com/questions/1059346/apt-get-update-not-working-
signing-verification-errors which suggests several solutions.  If not,
let us know.

However, it's possible that the gpg error is hiding the earlier error,
and potentially once its resolved the earlier error will come back.  So
I'll leave this issue open for now.

** Changed in: libseccomp (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1890332

Title:
  apt update fails on unprivileged docker arm container due to invalid
  gpg signature

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