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Qbittorent was working fine but today it wouldn't open so I typed qbittorrent into the terminal window and this is the error I received.

qbittorrent: symbol lookup error: qbittorrent: undefined symbol: _ZN10libtorrent7sessionC1ERKNS_11fingerprintEii


Any thoughts?

Hi,
Try to downgrade the libtorrent to version 0.15.6. The issue could be cause by qBittorrent starting minimized. Open terminal and edited the file in ~/.config/qBittorrent and changed StartMinimized from true to false. I'm hopping this will to help You.
Take care.