Laminar web UI mostly missing, wrong chartjs version

[Peter Hartley]

I installed the laminard package (laminard_1.1-1build1) on Ubuntu 22.04LTS on a Raspberry Pi 3 (64-bit ARM). But most of Laminar's Web UI is missing when you go to http://localhost:8080 (you just get a grey bar across the top of the screen).

Using browsers' "developer tools" mode, the Web UI's Javascript is erroring trying to use 'Chart.scaleService', which is a Chart.js 2.x API that was removed in Chart.js 3.0.

The Chart.js version in question is compiled into the laminard package at package-build time. Looking into the Ubuntu/Debian changes to this package (laminar_1.1-1build1.debian.tar.xz) there is a patch that changes upstream's fetching of Chart.js 2.x specifically, to a reference to a local-to-the-build-host copy of Chart.js with no version checking. If the build host had a 3.x copy of Chart.js in that location, then that would explain the failure: the package would build without any visible failure, but the Javascript would fail at runtime with the symptoms described.