Comment 2 for bug 1847647

The behaviour when reporting bugs on Ubuntu (and only there) is a special case requested by Ubuntu in order to steer people towards using "ubuntu-bug" instead, because they were getting too many bug reports with insufficient information, and ubuntu-bug did a better job of collecting more useful details up-front. While this special case is implemented in Launchpad's code, the policy is not something that Launchpad can unilaterally change; a change to that would have to be discussed and agreed through Ubuntu's community processes.

I can confirm the "I don't know" part of this, though. Things work fine if you're starting from https://bugs.launchpad.net/ubuntu/+filebug?no-redirect, but if you're starting from https://bugs.launchpad.net/ubuntu/+source/evince/+filebug?no-redirect then the form processing code inappropriately uses field.packagename even though packagename_option is set to "none" in the submitted form. This is odd because FileBugViewBase.submit_bug_action is certainly trying to take packagename_option=none into account, so we'll need to dig into that and figure out what's going on. I'm repurposing this bug to cover just that part of your report.