Using free(dom) software sometimes require you invest resources in some other way, depending on the particular issue and how important it is to you ;)
Agreed. But the package manager will have a much easier time than me at nailing down the problem and do it in much less time. I've already spent time investigating and isolating the problem so I consider that to be my contribution to the issue.
Just documenting an issues is still helpful, as it might help other Roundcube users (on Debian) save time, e.g. by not redoing your investigation.
Yes, good point. I'll submit the report. Thanks.