I updated the Ubuntu servers affected by the "tx_timeout" problem with the 
Kernel HWE
=> I do not meet any more "tx_timeout" since this update.

Command used to install kernel 4.18 :
sudo apt install --install-recommends linux-generic-hwe-18.04

Network card driver i40e :
- Linux 4.15 : Intel(R) Ethernet Connection XL710 Network Driver - version 
- Linux 4.18 : Intel(R) Ethernet Connection XL710 Network Driver - version 

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  Intel XL710 - i40e driver does not work with kernel 4.15 (Ubuntu

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  Today Ubuntu 16.04 LTS Enablement Stacks has moved from the Kernel
  4.13 to the Kernel 4.15.0-24-generic.

  On a "Dell PowerEdge R330" server with a network adapter "Intel
  Ethernet Converged Network Adapter X710-DA2" (driver i40e) the network
  card no longer works and permanently displays these three lines :

  [   98.012098] i40e 0000:01:00.0 enp1s0f0: tx_timeout: VSI_seid: 388, Q 8, 
NTC: 0x0, HWB: 0x0, NTU: 0x1, TAIL: 0x1, INT: 0x1
  [   98.012119] i40e 0000:01:00.0 enp1s0f0: tx_timeout recovery level 11, 
hung_queue 8
  [   98.012125] i40e 0000:01:00.0 enp1s0f0: tx_timeout recovery unsuccessful

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