Public bug reported:
`python3-magnum-ui` 18.0.0-0ubuntu1 installs Horizon SCSS static assets
that reference the undefined variable `$gray-lighter`.
This breaks `openstack-dashboard` package configuration when `openstack-
dashboard` and `python3-magnum-ui` are installed together, because
Horizon’s postinst runs static asset collection and compression after
the Magnum UI assets are staged.
## Affected Packages
* Source package: `magnum-ui`
* Binary package: `python3-magnum-ui`
* Version: `18.0.0-0ubuntu1`
* Ubuntu series observed: `resolute`
* Related package: `openstack-dashboard` `4:25.7.1-0ubuntu1`
## Steps to Reproduce
1. In a clean resolute environment, install both packages in one
transaction:
`apt install openstack-dashboard python3-magnum-ui`
2. Observe `openstack-dashboard` postinst running static asset
collection and compression after both packages are staged.
## Error Observed
`openstack-dashboard` fails to configure during static asset
compression:
```text
Collecting and compressing static assets...
CommandError: An error occurred during rendering _stylesheets.html: Error:
Undefined variable: "$gray-lighter".
on line 9:15 of
../../../var/lib/openstack-dashboard/static/dashboard/container-infra/clusters/clusters.scss
from line 1:9 of
../../../var/lib/openstack-dashboard/static/dashboard/container-infra/container-infra.scss
>> fill: $gray-lighter;
--------------^
dpkg: error processing package openstack-dashboard (--configure):
old openstack-dashboard package postinst maintainer script subprocess failed
with exit status 1
```
`python3-magnum-ui` is then left unconfigured because its dependency on
`openstack-dashboard` cannot be satisfied:
```text
dpkg: dependency problems prevent configuration of python3-magnum-ui:
python3-magnum-ui depends on openstack-dashboard (>=
4:22.2.0+git2022071815.f3767aba9-0ubuntu2~); however:
Package openstack-dashboard is not configured yet.
dpkg: error processing package python3-magnum-ui (--configure):
dependency problems - leaving unconfigured
```
## Expected Result
Installing `openstack-dashboard` and `python3-magnum-ui` in the same apt
transaction should complete successfully.
The Magnum UI static assets should either avoid references to undefined
Horizon SCSS variables, import the required variable definitions
correctly, or be patched to use variables available in the packaged
Horizon theme stack.
## Actual Result
`openstack-dashboard` fails during postinst static asset compression
because Magnum UI’s SCSS references `$gray-lighter`, which is not
defined in the active compression context.
This leaves both `openstack-dashboard` and `python3-magnum-ui`
unconfigured.
** Affects: snap-openstack
Importance: Undecided
Status: Triaged
** Affects: snap-openstack/2026.1
Importance: Undecided
Status: Triaged
** Affects: magnum-ui (Ubuntu)
Importance: Undecided
Status: New
** Also affects: magnum-ui
Importance: Undecided
Status: New
** No longer affects: magnum-ui
** Also affects: snap-openstack
Importance: Undecided
Status: New
** Also affects: snap-openstack/2026.1
Importance: Undecided
Status: New
** Changed in: snap-openstack/2026.1
Status: New => Incomplete
** Changed in: snap-openstack/2026.1
Status: Incomplete => Triaged
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https://bugs.launchpad.net/bugs/2155145
Title:
python3-magnum-ui invalid scss variable fails config step
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