Hi Kevin,
Hope you are keeping well.
Please note that the Sentinel LDK 7.4 is not officially tested over Ubuntu 16.04 LTS. However, the same behavior has already been reported to our RnD Team.
As per the update from the team, this would be fixed in our upcoming release Sentinel LDK 7.5 which is tentatively scheduled for October.
Thank you,
Gaurav Bhanot