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OK started calibre from terminal that give this " jan@xubu18:~$ calibre
<code>qt.qpa.xcb: QXcbConnection: XCB error: 148 (Unknown), sequence: 184, resource id: 0, major code: 140 (Unknown), minor code: 20 </code>
then in other terminal your code give same error cntr z and
<code> calibre-debug -w file.epub
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 95.9763837638 x 96.0945812808
Using calibre Qt style: True
Cannot read from: file.epub
qt.qpa.xcb: QXcbConnection: XCB error: 148 (Unknown), sequence: 184, resource id: 0, major code: 140 (Unknown), minor code: 20
Book prepared in 0.00 seconds </code>
but took six
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