Upgrading calibre from 5.x to 6.x is not a hardware related decision. I want to know from the OP why they are not upgrading. I know there have been linux distro issues in the past for some people who stick to super old versions. I don’t get why anyone would bother sticking with an OS if it is restricting what versions of apps you can run on it but each to their own.
Supporting older calibre versions is an overhead for plugin developers and as I appear to have accidentally proven here can be non trivial to get right. I’m curious what the resistance point here is as a current example. It’s not as if you risk issues with your library - 6.x has been out for a long while now and Kovid does a phenomenal job with upgrades to make it seamless for users.
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