igb network card on Intel N3350 board: continuous network reset

We had a weird issue few days ago, with a compact UTM based on Intel Celeron N3350 on board.

When installing Ubuntu, the onboard network card Intel I211 were not working at all. In syslog and dmesg we could see a kernel dump and then, when network was accessed, the card was continuously being reset.

[  113.061802] igb 0000:06:00.0 enp6s0: igb: enp1s0 NIC Link is Down
[  113.924585] igb 0000:06:00.0 enp6s0: Reset adapter
[  115.633067] igb 0000:06:00.0 enp6s0: igb: enp1s0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
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