gstreamer-qapt.postinst script "update-alternatives: error: alternative path /usr/lib/kde4/libexec/qapt-gst-helper doesn't exist"

[Rik Mills]

gstreamer-qapt.postinst script produces error update-alternatives: error: alternative path /usr/lib/kde4/libexec/qapt-gst-helper doesn't exist

In fact, both the postinst and prerm scripts are using the old incorrect paths to qapt-gst-helper

Should for example be /usr/lib/x86_64-linux-gnu/libexec/qapt-gst-helper on amd64 and similar multiarch paths in place of 'x86_64-linux-gnu' on other architectures.

Debian 'fixed' this with:

https://anonscm.debian.org/cgit/pkg-kde/kde-extras/qapt.git/commit/?id=cef992921a18ebb918178f704b4c5c689d1a94a3

however, it does not produce the correct path.

i.e. /$DPKG_MAINTSCRIPT/_ARCH becomes /amd64/ /i386/ etc, so this would still fail.

As kindly suggested by Maximiliano Curia from debian, we need to

"move the maintscripts to .in and generate the "right" maintscript at build time [10:29] (using a magic rule and sed)"

[Launchpad Janitor (janitor)]

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

[Jb (jebsolutions)]

Problem still exists on Ubuntu 16.04:

Setting up gstreamer-qapt (3.0.2-0ubuntu1.2) ...
update-alternatives: error: alternative path /usr/lib/kde4/libexec/qapt-gst-helper doesn't exist