same also happens on arm64 server
```
Found initrd image: /boot/initrd.img-6.14.0-33-generic
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
Processing triggers for ca-certificates (20250419) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
Processing triggers for shim-signed (1.59+15.8-0ubuntu2) ...
Processing triggers for initramfs-tools (0.150ubuntu3) ...
update-initramfs: Generating /boot/initrd.img-6.17.0-5-generic
Errors were encountered while processing:
 cloud-init-base
 cloud-init
needrestart is being skipped since dpkg has failed
packages have been installed but needrestart is suspended
Exception during pm.DoInstall():  E:Sub-process /usr/bin/dpkg returned an error 
code (1)

*** Send problem report to the developers?

After the problem report has been sent, please fill out the form in the
automatically opened web browser.

What would you like to do? Your options are:
  S: Send report (515.9 KB)
  V: View report
  K: Keep report file for sending later or copying to somewhere else
  I: Cancel and ignore future crashes of this program version
  C: Cancel
Please choose (S/V/K/I/C): K
Problem report file: /var/crash/cloud-init-base.0.crash

Could not install the upgrades

The upgrade has aborted. Your system could be in an unusable state. A 
recovery will run now (dpkg --configure -a). 

Setting up cloud-init-base (25.3~2g890873f5-0ubuntu2) ...
Migrating debconf value: cloud-init/local-cloud-config -> 
cloud-init-base/local-cloud-config
dpkg: error processing package cloud-init-base (--configure):
 installed cloud-init-base package post-installation script subprocess returned 
error exit status 128
dpkg: dependency problems prevent configuration of cloud-init:
 cloud-init depends on cloud-init-base (= 25.3~2g890873f5-0ubuntu2); however:
  Package cloud-init-base is not configured yet.

dpkg: error processing package cloud-init (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 cloud-init-base
 cloud-init

Upgrade complete

The upgrade has completed but there were errors during the upgrade 
process. 

To continue please press [ENTER]

To continue please press [ENTER]
=== Command detached from window (Tue Oct  7 16:04:08 2025) ===
```
after a manual reboot, can boot `Welcome to Ubuntu 25.10 (GNU/Linux 
6.17.0-5-generic aarch64)`


** Attachment added: "arm64_cloud-init-base.0.crash"
   
https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/2127022/+attachment/5916133/+files/arm64_cloud-init-base.0.crash

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2127022

Title:
  upgrade from Plucky to Questing cloud-init-base
  25.3~2g890873f5-0ubuntu2 failed to install/upgrade

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