[Bug 2121151] Re: keyserver.ubuntu.com sporadically unreachable

[Sam Darwin]

** Also affects: apt (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2121151

Title:
  keyserver.ubuntu.com sporadically unreachable

Status in Ubuntu:
  New
Status in apt package in Ubuntu:
  New

Bug description:
  Hi,
  We are running CI tests to support open-source code repositories, and somewhat frequently those will fail with this error:

  curl: (7) Failed to connect to keyserver.ubuntu.com port 80 after 4002 ms: Couldn't connect to server
  gpg: no valid OpenPGP data found.

  Another separate set of log output that sometimes occurs:

  >>>>> APT: REPOSITORIES...
          Adding repository ppa:ubuntu-toolchain-r/test
  VERSION_CODENAME is jammy
  curl: (7) Couldn't connect to server
  gpg: no valid OpenPGP data found.

  The above errors might be different problems, or the same one.

  Out of 40 tests, maybe one will get this error. The test suite shows
  red instead of green. This continues to happen day after day rather
  than being a one-time issue.

  The CI servers are hosted Github Actions or self-hosted AWS servers.

  This is reminiscent of https://bugs.launchpad.net/ubuntu/+bug/435193
  "keyserver.ubuntu.com down all time - (110) Connection timed out",
  from many years ago.

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