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True, it is a message from the operating system.
I have Ubuntu 20.04 and Calibre 5.26 installed
The message appears approximately 30 seconds after the option starts running. All other options take 2-3 seconds to finish
I have taken a few screenshots of the memory usage of the computer. As you can see, when that option is working, it takes up all the system memory. In the second screenshot you can see how resources are released when I close Calibre
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