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

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: apt (Ubuntu)
       Status: New => Confirmed

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Title:
  apt update fails on docker arm container 20.04

Status in apt package in Ubuntu:
  Confirmed

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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