12.04.txt

[    0.578917] r8168: module verification failed: signature and/or required key missing - tainting kernel
[    0.579296] r8168 Gigabit Ethernet driver 8.037.00-NAPI loaded
[    0.579468] r8168 0000:03:00.0: irq 44 for MSI/MSI-X
[   13.893795] r8168: eth0: link up

14.04.txt

no occurence of the word "gigabit" or "ethernet" or "eth0" in dmesg

rescue.txt

[    1.124130] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[    1.124137] r8169 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
[    1.124927] r8169 0000:03:00.0 eth0: RTL8168f/8111f at 0xffffc9000315e000, c8:60:00:df:08:76, XID 08000880 IRQ 27
[    1.124929] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[    2.305870] r8169 0000:03:00.0 eth0: link down
[    2.305871] r8169 0000:03:00.0 eth0: link down
[    4.782872] r8169 0000:03:00.0 eth0: link up
[    4.782877] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready