“debian guy” does not upgrade the package in Debian. YOU do.
Um, you do realize the 1.1 is ALREADY in Debian and already merged into Ubuntu 19.04?
Asking for a version-bump in an already-released version of Ubuntu is very, very unlikely.
Look up how a Stable Release Update works, learn the process, and determine if your bug qualifies. That WON’T get 1.1 into 18.10. It will merely get the bug fixed in 18.10 with a patch.
Also look up how Ubuntu Backports work, and that process. This WILL get 1.1 into 18.10…but not immediately.
Those two links will tell you which teams you must subscribe to the bug report, and in which order.
Finally, please test 19.04 to ensure the problem is really fixed. The best time to report these problems, the time they will get fixed fastest, is before release.
I know this seems cumbersome - “do this first, read that, go there, touch second base.” Ubuntu’s user base is BIG, and Launchpad gets a huge volume of bug reports. Bluntly, many of those reports are useless, and their noise obscures your signal. Individual reporters (you) are responsible to make sure that the bugs are reported correctly simply because there are not enough volunteer triagers to do it for you. Turns out very few Ubuntu users want to volunteer that way.
The SRU and Backports teams, a mix of paid engineers and volunteers, gets far more requests each day than they can possibly address - so they address the problems that are most serious AND easiest to fix. Just like you or I would. It’s up to you to make the seriousness obvious to them (don’t exaggerate) and make the fix easy for them to implement.
I think you have reported a serious issue (thank you), and I think you have a good chance of an approved SRU. You must continue to push your bug…by pushing the SRU first and making the SRU team’s job as easy as possible.