Ubuntu
cloud-init package

Cloud-init creates /etc/apt/sources.list.d/ubuntu.sources even if /etc/apt/sources.list exists

Bug #2045086 reported by Heinrich Schuchardt on 2023-11-29

This bug affects 3 people

Affects		Status	Importance	Assigned to	Milestone
	cloud-init (Ubuntu)	Fix Released	Medium	Alberto Contreras

Bug Description

The RISC-V preinstalled server image noble-preinstalled-server-riscv64.img has a file /etc/apt/sources.list.

After first boot I additionally find /etc/apt/sources.list.d/ubuntu.sources which is created by cloud-init.

This leads to failures in 'apt-get update' like:

W: Target CNF (multiverse/cnf/Commands-riscv64) is configured multiple times in /etc/apt/sources.list:41 and /etc/apt/sources.list.d/ubuntu.sources:2
W: Target CNF (multiverse/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list:41 and /etc/apt/sources.list.d/ubuntu.sources:2

Cloud-init should avoid creating duplicate apt source. If /etc/apt/sources.list already exists, cloud-init should not try to generate /etc/apt/sources.list.d/ubuntu.sources.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2023-11-30:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in cloud-init (Ubuntu):
status:	New → Confirmed

Revision history for this message

Alberto Contreras (aciba) wrote on 2023-12-14:

Thanks, Heinrich, for reporting this and making cloud-init better.

I can confirm this is reproducible in noble. Those warnings are not hard errors and apt works correctly, but having two sources of config could lead to conflicts / unexpected behavior / hard apt errors in the future. In addition to that, the warnings could be a concern for users, so I think this is a bug that has to be fixed.

cloud-init upstream bug: https://github.com/canonical/cloud-init/issues/4691

Changed in cloud-init (Ubuntu):
status:	Confirmed → Triaged
importance:	Undecided → Medium

Revision history for this message

Chad Smith (chad.smith) wrote on 2023-12-14:

This appears to be an artifact of the image creation process. I can also confirm that the /etc/apt/sources.list file in the image has a timestamp at the image creation date, not the cloud-init launch date. And cloud-init only writes /etc/apt/sources.list.d/ubuntu.sources.

root@unique-terrapin:~# lsb_release -sc
No LSB modules are available.
noble
root@unique-terrapin:~# cat /etc/cloud/build.info
build_name: server
serial: 20231213
root@unique-terrapin:~# ls -l --full-time /etc/apt/sources.list
-rw-r--r-- 1 root root 2403 2023-12-13 08:38:45.000000000 +0000 /etc/apt/sources.list
root@unique-terrapin:~# egrep 'Writing.*/etc' /var/log/cloud-init.log
2023-12-14 19:54:04,260 - util.py[DEBUG]: Writing to /etc/hostname - wb: [644] 16 bytes
2023-12-14 19:54:04,363 - util.py[DEBUG]: Writing to /etc/netplan/50-cloud-init.yaml - wb: [600] 389 bytes
2023-12-14 19:54:05,613 - util.py[DEBUG]: Writing to /etc/sudoers.d/90-cloud-init-users - wb: [440] 131 bytes
2023-12-14 19:54:09,640 - util.py[DEBUG]: Writing to /etc/apt/sources.list.d/ubuntu.sources - wb: [644] 3097 bytes

Revision history for this message

Alberto Contreras (aciba) wrote on 2024-01-04:

Fix committed here: https://github.com/canonical/cloud-init/pull/4699

Changed in cloud-init (Ubuntu):
assignee:	nobody → Alberto Contreras (aciba)
status:	Triaged → Fix Committed

Revision history for this message

Launchpad Janitor (janitor) wrote on 2024-01-04:

This bug was fixed in the package cloud-init - 24.1~2gb6a1c635-0ubuntu1

---------------
cloud-init (24.1~2gb6a1c635-0ubuntu1) noble; urgency=medium

* Upstream snapshot based on upstream/main at b6a1c635.
- Bugs fixed in this snapshot: (LP: #2045086, #1951639)

-- Alberto Contreras <email address hidden> Thu, 04 Jan 2024 10:16:55 +0100

Changed in cloud-init (Ubuntu):
status:	Fix Committed → Fix Released

Revision history for this message

Chad Smith (chad.smith) wrote on 2024-01-15:

Expect cloudimages with /etc/cloud/build.info serial number greater than `serial: 20241010` to have a fix landed. cloud-init 24.1~2 is already released and available in noble-updates