XPS 13 9370, under ubuntu 18.4 Thunderbolt update 33.00

Hi,

I got a Dell XPS 9370 running under ubuntu 18.04.1 LTS.

I ad a notification to update Thunderbolt driver up to version 33.00.

The fact is that I have an error message since two days about this update, even after several shutdown or update.

Here is the screenshot as attachment.

Update center without notificationUpdate center with notification

The update notification means : 

Impossible to update "Thunderbolt NVM for Xps 9370", could not detect device while waiting for device.

Thank you in advance for your support.