redmine - upgrade from stretch to buster, using buster-backports

[Richard Hector <richard@walnut.gen.nz>]

Hi,

I'm not sure if this is the right place, or if I can adequately explain 
what happened ...

I'm upgrading a stretch system to buster. It has redmine, which doesn't 
exist in buster, so after the initial upgrade, and before the 
full-upgrade (which wanted to remove redmine), I added buster-backports 
to my sources.list. After a lot of playing around to try and get it to 
work, I eventually ran "apt-get install -tbuster-backports redmine 
redmine-pgsql". That ran, but gave an error that it couldn't find the 
gem rmagick. I found that ruby-rmagick was upgradeable, so I upgraded it 
and tried again. Now redmine finished installing.

I suspect that this means redmine should declare a dependency on the 
newer ruby-rmagick? Currently it depends on >= 2.14.0, while buster has 
2.16.0-6 and stretch has 2.16.0-2+b1.

I guess this normally doesn't get hit, because people install the 
backported redmine on an up-to-date buster system, rather than trying to 
combine it with an upgrade ...

Regarding the earlier issues - is there a way to tell apt(-get) to pick 
a particular package from backports during a full-upgrade?

I'm still to see if redmine still works ...

Cheers,
Richard