I have just finished setting up the Travis AppImage scripts for HDRMerge.
I would greatly appreciate if you could give me some feedback regarding wether the HDRMerge AppImage works on your preferred linux distribution, and if you could provide me the full terminal output in case it fails. Positive feedback is also needed in order to see which linux versions are OK, as I only tested Ubuntu 17.04 so far.
The AppImage packages can be downloaded from here.
Once the package is verified, I will set things up such that a new package will be built each time there is a commit pushed to github.