I installed MonoDevelop 6 via FlatPak (http://www.monodevelop.com/download/linux/). Now I'm trying to attach to a running process to be able to debug it. But all I can see in MonoDevelop under Run --> Attach to Process are four processes, I guess from inside the FlatPak sandbox.
How can I attach to a process with MonoDevelop running inside FlatPak?
My guess is that you can do nothing at this moment,
http://apebox.org/wordpress/linux/1184
The packager has documented many past and current issues related to the sandboxing and it might take extra time to fix.