Cannot follow system dark theme on Ubuntu

Issue type

UI bug (incorrect info or interface appearance)

Description with steps to reproduce

On Fedora there is option to follow system light/dark theme (so when I changed it system-wide, MuseScore changed it's theme accordingly). But few days ago I moved to Ubuntu and now I don't see that it. Is it disabled on Ubuntu, or am I missing something?

Supporting files, videos and screenshots

Fedora:

Ubuntu:

What is the latest version of MuseScore Studio where this issue is present?

OS: Ubuntu 24.10, Arch.: x86_64, MuseScore Studio version (64-bit): 4.4.4-243461245, revision: github-musescore-musescore-2232670

Regression

I was unable to check

Operating system

Ubuntu 24.10

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

Start by reproducing the missing system-theme option on Ubuntu 24.10 and comparing the available theme settings with Fedora, using the screenshots and version details in the report. Done means MuseScore offers the expected system light/dark theme behavior on Ubuntu, with regression coverage if the relevant test area is found.