Autobuild: Linux ARM build fails due to dependency issues

[ann0see]

Describe the bug

The CI check for armhf fails: https://github.com/jamulussoftware/jamulus/runs/8178983224?check_suite_focus=true and the log gives a dependency error message. Probably something changed on the ubuntu repo about qt5?

To Reproduce
Start a armhf .deb build on GitHub

Expected behavior

Build executes without errors

Screenshots

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Operating system

Ubuntu, ARMHF build

Version of Jamulus

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Additional context

https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1209239 (not yet read)

[hoffie]

I've tried reproducing the issue and failed: The most-recent Ubuntu 18.04 image works for me. Turns out, meanwhile it works on Github as well (manually run build): https://github.com/jamulussoftware/jamulus/runs/8226397369?check_suite_focus=true

I was able to confirm that the image version with the digest sha256:3aa2ccb021969aadb28381fee1b247422e845b176e241cd1540c4b6831e000bb did indeed fail in that way, also when tested locally.

So the explanation is that there was a problematic ubuntu:18.04 docker image version.

If we ever encounter a similar issue, a workaround would be to revert to the previously working version by substituting ubuntu:18.04 by ubuntu@sha256:...digest.of.previously.working.version.from.build.logs in autobuild.yml.

I was unable to find some kind of changelog for the ubuntu:18.04 docker image which might have had an explanation for this. I've quickly checked apt.sources* and did not spot anything specific.