Hi folks, when I tried to fix this bug I realised that new upstream versions are out. I downloaded the latest one and imported it into Git[1]. Since I don't know the software I would like to ask you about your reasons you might have to stick to version 1.4. There are some patches to fix and may be some tests to do which I can't. So may be if I do not hear from you I'd probably only go with the restriction of architectures to amd64/i386 to fix #897239.
Kind regards Andreas. [1] https://salsa.debian.org/med-team/relion -- http://fam-tille.de