Yep, just edit line 79 from
Code:
$KU_BIN -onboardmount="${MNT_ONBOARD_NEW}"
to
Code:
$KU_BIN -onboardmount="${MNT_ONBOARD_NEW}" 2> "${MNT_ONBOARD_NEW}/.adds/kobo-uncaged/error.log"
Then run again. Hopefully, there will then be an 'error.log' file in the kobo-uncaged directory afterwards.