Public bug reported:

on questing with autopkgtest 5.49:

autopkgtest-buildvm-ubuntu-cloud -v -a amd64 -r resolute -s 10G

=>

[  OK  ] Started cloud-init-main.service - Cloud-init: Single Process.
[   31.811333] cloud-init[255]: Cloud-init v. 25.4~1gcb12e00e-0ubuntu1 running 
'init-local' at Fri, 14 Nov 2025 10:28:08 +0000. Up 30.97 seconds.
[   34.301485] cloud-init[255]: 2025-11-14 10:28:11,405 - util.py[WARNING]: 
Failed loading yaml blob. Yaml load allows (<class 'dict'>,) root types, but 
got str instead
[   35.072548] cloud-init[255]: 2025-11-14 10:28:12,187 - util.py[WARNING]: 
Failed loading yaml blob. Yaml load allows (<class 'dict'>,) root types, but 
got str instead
[...]
   55.245757] cloud-init[255]: 2025-11-14 10:28:32,342 - util.py[WARNING]: 
Failed loading yaml blob. Yaml load allows (<class 'dict'>,) root types, but 
got str instead
[   55.906630] cloud-init[255]: 2025-11-14 10:28:33,021 - util.py[WARNING]: 
Failed loading yaml blob. Yaml load allows (<class 'dict'>,) root types, but 
got str instead
[...]
[   60.063542] cloud-init[255]: 2025-11-14 10:28:37,180 - util.py[WARNING]: 
Failed loading yaml blob. Yaml load allows (<class 'dict'>,) root types, but 
got str instead
[   61.721587] cloud-init[255]: 2025-11-14 10:28:38,828 - util.py[WARNING]: 
Failed loading yaml blob. Yaml load allows (<class 'dict'>,) root types, but 
got str instead
[   62.341545] cloud-init[255]: 2025-11-14 10:28:39,459 - schema.py[WARNING]: 
cloud-config failed schema validation! You may run 'sudo cloud-init schema 
--system' to check the details.
[   62.998654] cloud-init[255]: dpkg: error: --add-architecture takes exactly 
one argument
[   63.004651] cloud-init[255]: Type dpkg --help for help about installing and 
deinstalling packages [*];
[   63.010574] cloud-init[255]: Use 'apt' or 'aptitude' for user-friendly 
package management;
[   63.016453] cloud-init[255]: Type dpkg -Dhelp for a list of dpkg debug flag 
values;
[   63.022926] cloud-init[255]: Type dpkg --force-help for a list of forcing 
options;
[   63.028051] cloud-init[255]: Type dpkg-deb --help for help about 
manipulating *.deb files;


- the seeding yaml seems to have wrong format?
- dpkg --add-architecture was called with 0 or >=2 args?

** Affects: autopkgtest (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2131431

Title:
  qemu image cloud-init yaml validation fails, dpkg architecture error

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