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Traceback (most recent call last):
File "/usr/lib/calibre/calibre/gui2/device.py", line 88, in run
	self.result = self.func(*self.args, **self.kwargs)
File "/usr/lib/calibre/calibre/gui2/device.py", line 506, in _books
	mainlist = self.device.books(oncard=None, end_session=False)
File "/usr/lib/calibre/calibre/devices/kobo/driver.py", line 1772, in books
	cursor.execute(query)
File "src/cursor.c", line 236, in resetcursor
CorruptError: CorruptError: database disk image is malformed

• backup + delete metadata.db from the Calibre library directory (source)
• if this happens only when the Kobo is attached... then it's the Kobo. Log out + log in from the account configured on the device to force rebuilding the device database. You'll have to reconfigure the WiFi too. (source)