[Bug 1890332] Re: apt update fails on docker arm container 20.04

[Anthony C]

The root cause of the problem [is in libseccomp
When][1]. The newer version fixes the problem, but it is not yet available in Debian's stable repos. There are two way to fix this problem:

**Method 1**

Start the container with `--privileged`. This bypasses docker's security
measures, so it is not recommended.

**Method 2**

Upgrade libseccomp manually. Dowload version from unstable repos (I
tested with 2.4.3-1) [here][2].

Uninstall the current version:

`sudo dpkg --force-all -P libseccomp2`

Install the new version:

`sudo dpkg -i libseccomp2_2.4.3-1+b1_armhf.deb`


  [1]: https://github.com/moby/moby/issues/40734
  [2]: https://packages.debian.org/sid/libseccomp2

** Bug watch added: github.com/moby/moby/issues #40734
   https://github.com/moby/moby/issues/40734

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

Title:
  apt update fails on docker arm container 20.04

Status in apt package in Ubuntu:
  New

Bug description:
  Running `apt update` in a ubuntu:20.04 docker container on raspberry
  pi fails with GPG errors.

  Expected behaviour:

  Successfully update the system through `apt update`

  What happens instead:

  `Err:1 http://ports.ubuntu.com/ubuntu-ports focal InRelease
    At least one invalid signature was encountered.`

  Complete log:
  https://pastebin.com/sggGJcY1

  How to reproduce:
  On a Raspberry Pi 3b or 4b (and maybe others ?), run the following command:
  `docker run ubuntu:latest apt update`
  or more specifically:
  `docker run arm32v7/ubuntu:20.04 apt update`

  More information:
  I can reproduce the bug on the following host systems:
  * Raspberry Pi 3b running HypriotOS
  * Raspberry Pi 4b running Raspbian GNU/Linux 10 (buster)

  The problem does not happens on the following host system:
  * Raspberry Pi 3b running Arch Linux Arm

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