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I am guessing that you probably have something corrupt in your Calibre preferences. These will be stored in your home folder (I think in a .calibre folder on Linux). If you rename that folder and start up Calibre then (assuming it starts OK) it should then start as if it were a new installation. Point it at your existing library and you should be good to go although you will have to redo any prefences you changed from default values..
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