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[Chad Smith <1868232@xxxxxxxxxxxxxxxxxx>]

This bug is believed to be fixed in cloud-init in version 20.2. If this
is still a problem for you, please make a comment and set the state back
to New

Thank you.

** Changed in: cloud-init
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1868232

Title:
  underscores should be stripped from hostnames generated for apt config

Status in cloud-init:
  Fix Released
Status in cloud-init package in Ubuntu:
  Fix Committed
Status in cloud-init source package in Focal:
  Fix Committed

Bug description:
  In a ticket filed in the Ubuntu RT instance we were made aware of an
  issue where if a cloud is configured with an “_” in the region name,
  cloud-init will generate an apt configuration that also includes that
  “_” in the name.

  So for example if the region name is zone_01, apt will be configured
  to use zone_01.clouds.archive.ubuntu.com.

  On Friday March 13th we deployed some new archive servers on 18.04
  using Apache 2.4.29-1ubuntu4.13. This version of apache has more
  strict protocol options than previous versions, per
  https://httpd.apache.org/docs/2.4/mod/core.html#httpprotocoloptions
  and the result is that a request to zone_01.clouds.archive.ubuntu.com
  returns a 400 Bad Request.

  Could cloud-init be updated to remove non-permitted characters
  including “_” per https://tools.ietf.org/html/rfc3986#section-3.2.2 ?

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