Improve message error for installing FUSE on Ubuntu

[99Arrzel]

When trying to run AppImages without fuse on Ubuntu this error appears

AppImages require FUSE to run. 
You might still be able to extract the contents of this AppImage 
if you run it with the --appimage-extract option. 
See https://github.com/AppImage/AppImageKit/wiki/FUSE 
for more information

Can we do a simple bash script to test if it's ubuntu? Something that does cat /etc/os-release and suggests the same as this

Might try to do a PR if the issue is accepted (IDK if this issue belongs here)

[Samueru-sama]

Note that libfuse2 is no longer needed if you use the static appimage runtime or similar and the only requirement is a fusermount* binary in PATH, which all distros have as far as I know since that's a dependency of common pacakges like gvfs, ntfs-3g and the xdg-desktop-portal (flatpak).