I've tried on and off for several weeks now to create a .desktop file for the Ungoogled Chromium AppImage I use. I had tried to install the browser through other means, such as through the instructions on its github which includes building binaries, but they either didn't work, didn't produce anything use-able, or, in the case of the binaries, was left to work for around 12 hours and did not seem to make anything I could use, or figure out how to use. I've tried asking in the Xubuntu help channel several times in regards to making a .desktop file for the AppImage I end up having to use, as well as searching for a solution on my own, but nothing I could find ended up working properly, leading me to just have to navigate to the AppImage and open it every time.
Now, on a new install of Xubuntu, I tried doing the same thing, but the AppImage wont start, asking me what application I wish to use to open it, while recommending none, instead of allowing me to simply execute it as I had done on my other Xubuntu system. It would be greatly appreciated If I could also get some help on making Xubuntu accept it as my default browser, as right now I currently get an error, but my primary issue is I've got absolutely no idea what I can do to create a functioning .desktop file which allows the AppImage to be searchable and then launchable. I'm using 22.04 Xubuntu installed from a USB onto a fresh storage device. Just started using Linux recently, so being thorough would be greatly appreciated.