Appimage doesn't work on Debian-Testing

A, never used sharun, don't know what to do with that B. The other ones that don't work with that error, also don't work, but most appimages do work. C. I do, and a lot of other people do too. I asked around on Debian's fluxer support group, and they said that the libfuse2 dependency mostly comes from Electron, it's not a needed dependency on the actual app. They said that libfuse3 is the one to use now, because v2 is full of security holes etc.