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I recently upgraded from Ubuntu 19.10 to Ubuntu 20.04 LTS, and it seems that the upgraded kernel has broken the ethernet. The previous kernel (5.3.0-53-generic) is still able to be booted from, and seems to fix any issues with ethernet. My PC uses a Gigabyte Z77x-UD3H (revision 1.0), with a Qualcomm Atheros AR8151 V2.0 Gigabit Ethernet adapter. ip link shows that the interface (enp5s0) is UP and the driver reported by lshw -C network is atl1c and version is 1.0.1.1-NAPI, which is consistent between both kernels. On 5.4, pinging my network gateway (or any PC on my local network for that matter) just results in network unreachable. Any thoughts as to how I could fix this?

  • Are you sure the interface is up? – hedgie May 24 at 13:19
  • Yes, ip link shows the interface is up. – Jack Hayes May 24 at 23:33

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