Since the bug is not in calibre, but in the Qt - system integration, there isn't anything I can do to help you. You will need to fix whatever broke in your system. Places to start looking are
1) Use strace -f to try and figure out which system call is hanging
2) Disable/uninstall all qt 5 plugins your system might have
3) Try setting the environment variable CALIBRE_IGNORE_SYSTEM_THEME=1 although I doubt this will make any difference.
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