Problem solved. Odd scenario that might be of interest to people here. I decided that since none of the files were working, the problem had to be in the program itself. So I decided to just uninstall and re-install it, to see what that might do. So I went to the software manager, and discovered that there were three calibre programs listed: One just called Calibre. One called Calibre-bin. And one Calibre (Flatbed). Calibre (Flatbed) was not installed, so I installed it. Then everything worked. I then had two Libre icons in my menu bar. I uninstalled the one that has been there, and everything still works. In any case I thank you for your suggestions and willingness to hang in there with me on this.
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