

How are you trying to install Calibre? Is it via Flatpak? AppImage?
Did you try it from here? http://calibre-ebook.com/download_linux
I’m guessing that that method won’t work with atomic distros. I’m guessing that it’s trying to copy files to an immutable spot.
I would try looking for a Flatpak first.
I was going to suggest the portable one as a backup but that’s only for Windows :(
Oh that’s a neat app! I hadn’t heard of it before
Glad you got it going!