Ubuntu
livecd-rootfs package

Ubuntu desktop ISOs are around 700MB larger than legacy desktop ISOs

Bug #2038906 reported by Daniel van Vugt
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
livecd-rootfs (Ubuntu)
Confirmed
Low
Unassigned

Bug Description

Mantic ISOs are around 700MB larger than mantic legacy ISOs. That's 500MB-600MB more than I'd expect from just the new installer.

For example 2023-10-10:
mantic-desktop-amd64.iso: 4.8GB
mantic-desktop-legacy-amd64.iso: 4.1GB

Digging into the ISOs shows where the difference is:

mantic-desktop-amd64.iso:/casper:
...
277 minimal.standard.enhanced-secureboot.squashfs
291 minimal.enhanced-secureboot.squashfs
413 minimal.standard.squashfs
777 minimal.standard.live.squashfs
1654 minimal.squashfs
3737 total

mantic-desktop-legacy-amd64.iso:/casper:
...
2873 filesystem.squashfs
2990 total

More info:
https://docs.google.com/spreadsheets/d/e/2PACX-1vSmQLXuDO0E-tKnWcgjL3Ua2bWDeUg4ICZIfuMrrZndBrYjbVLKAWlKuiZLZ9EOrj4N1WV37DRg8GyW/pubchart?oid=2040836911&format=interactive

Tags: mantic noble
Revision history for this message
Steve Langasek (vorlon) wrote :

It is not just a new installer. It is also new install targets (TPM FDE) that require new squashfs layers.

There are some gains to be made by reducing duplication between some of the layers (minimal.standard.enhanced-secureboot.squashfs and minimal.enhanced-secureboot.squashfs should not ship the snaps, we should figure out how to put all of these in the minimal layer as preseeding and ensure they get removed from the target when doing a non-enhanced-secureboot install; and kernel debs should not be duplicated between the live layer and the package pool). But this work is not going to be done in mantic.

Revision history for this message
Launchpad Janitor (janitor) wrote :

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

Changed in livecd-rootfs (Ubuntu):
status: New → Confirmed
wontfix (wontfix)
tags: added: noble
Daniel van Vugt (vanvugt)
summary: - Mantic ISOs are around 700MB larger than mantic legacy ISOs
+ Ubuntu desktop ISOs are around 700MB larger than legacy desktop ISOs
Revision history for this message
Daniel van Vugt (vanvugt) wrote :

There's no legacy ISO to compare to anymore, so this isn't a bug we could ever verify a fix for.

Changed in livecd-rootfs (Ubuntu):
status: Confirmed → Won't Fix
Revision history for this message
Steve Langasek (vorlon) wrote :

There's still work to be done to reduce duplication of contents between the layers. Reopening this bug because I'm not sure offhand where else we're tracking that at the moment.

Changed in livecd-rootfs (Ubuntu):
status: Won't Fix → Confirmed
Revision history for this message
Michael Hudson-Doyle (mwhudson) wrote :

It's in Jira as well, fwiw.

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