** Description changed:

+ [ Impact ]
+ 
+  * Daily launches of arm64 platform with cloud-init 26.2 on noble run
+ into issues attempting to contact archive.ubuntu.com due to invalid
+ default apt mirror configuration being set.
+ 
+ 2026-10-22T09:33:28.0139640Z E: Failed to fetch
+ http://archive.ubuntu.com/ubuntu/dists/noble-backports/main/binary-
+ arm64/Packages  404  Not Found [IP: 91.189.92.23 80]
+ 
+ 
+ [ Test Plan ]
+ 
+  * launch daily arm64 image and confirm incorrect archive.ubuntu.com is 
configured in /etc/apt/sources.list.d/*, confirm apt update errors
+ ports.ubuntu.com is configured as the apt mirror instead of archive.ubuntu.com
+ 
+  * upgrade cloud-init to cloud-init_26.2-0ubuntu1~24.04.2 from noble-
+ proposed
+ 
+  * Clean all cloud-init artifacts and reboot:
+ 
+    sudo cloud-init clean --logs -c all --reboot
+ 
+  * Verify ports.ubuntu.com in /etc/apt/sources.list.d/* instead of
+ archive.ubuntu.com. Confirm no apt update error
+ 
+ 
+  test script:
+ TODO
+ 
+ 
+ [ Where problems could occur ]
+ 
+   * this is a highly specific fix that reverts a small single commit
+ that landed in upstream cloud-init to retain original behavior seen in
+ 26.1. Prior to 26.2
+ 
+ 
+ [ Other Info ]
+ 
+ [ Original Description ]
+ 
  It looks like the PR https://github.com/canonical/cloud-init/pull/6826
  was backported to noble, breaking arm64 targets, as noble stil uses
  ports.ubuntu.com.
  
  # Steps to reproduce the problem
  
  Install a noble arm64 image with could-init enabled.
  
  # Environment details
  
-  * noble
-  * arm64
-  * 26.1-0ubuntu1~24.04.1
+  * noble
+  * arm64
+  * 26.1-0ubuntu1~24.04.1
  
  # cloud-init logs
  
  Nothing relevant in logs, it just overrides ubuntu.sources with wrong
  addresses.

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https://bugs.launchpad.net/bugs/2171959

Title:
  cloud-init breaks noble arm64 targets

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