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[Launchpad Bug Tracker <1857468@xxxxxxxxxxxxxxxxxx>]

[Expired for cloud-init because there has been no activity for 60 days.]

** Changed in: cloud-init
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1857468

Title:
  Unable to set apt_preferences(5) parameter during maas-enlisting-node
  phase

Status in cloud-init:
  Expired
Status in MAAS:
  Expired

Bug description:
  During the maas-enlisting-node phase, cloud init tries to run an 'apt-
  get update' and it fails because of an error as given below:

  2019-12-18T06:08:39+00:00 maas-enlisting-node cloud-init[2655]: Get:4 http://<repo_name>/ubuntu bionic-security InRelease [10.1 kB]
  2019-12-18T06:08:39+00:00 maas-enlisting-node cloud-init[2655]: Err:5 http://<repo_name>/ubuntu bionic-backports Release
  2019-12-18T06:08:39+00:00 maas-enlisting-node cloud-init[2655]:   404  Not Found [IP: 32.68.226.74 80]
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: Reading package lists...
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: E: The repository 'http://<repo_name>/ubuntu bionic-backports Release' does not have a Release file.
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: E: Repository 'http://<repo_name>/ubuntu bionic InRelease' changed its 'Label' value from 'Ubuntu' to 'ubuntu bionic'
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: E: Repository 'http://<repo_name>/ubuntu bionic-updates InRelease' changed its 'Label' value from 'Ubuntu' to 'ubuntu bionic-updates'
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: E: Repository 'http://<repo_name>/ubuntu bionic-updates InRelease' changed its 'Codename' value from 'bionic' to 'bionic-updates'
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: E: Repository 'http://<repo_name>/ubuntu bionic-security InRelease' changed its 'Label' value from 'Ubuntu' to 'ubuntu bionic-security'
  2019-12-18T06:08:40+00:00 maas-enlisting-node cloud-init[2655]: E: Repository 'http://<repo_name>/ubuntu bionic-security InRelease' changed its 'Codename' value from 'bionic' to 'bionic-security'

  
  apt has an option to to ignore this error by providing a parameter -"--allow-releaseinfo-change", however I am unable to set this parameter in maas. Is there a place in the code or in the cloud init phase where we can set this option to avoid the above error? If not then would it make sense to add such functionality?

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