Kubuntu 19.04 – Wired Network drops at 1000 Mbps speed

Yesterday i made a sudo apt update and reboot. Later i realized my speed was kind of slow so i checked in Network Interfaces Gui setting was at:

  • allow auto-negotiate: unchecked
  • speed: 100 Mbits/s
  • duplex: half

Then decided to check the firts option and wired connection began to connected/disconnected back and forth.

Tried setting it to manual with no results. This is the output of ethtool:

Supported ports: [ TP ]     Supported link modes:   10baseT/Half 10baseT/Full                              100baseT/Half 100baseT/Full                              1000baseT/Full      Supported pause frame use: No     Supports auto-negotiation: Yes     Supported FEC modes: Not reported     Advertised link modes:  Not reported     Advertised pause frame use: No     Advertised auto-negotiation: No     Advertised FEC modes: Not reported     Speed: 100Mb/s     Duplex: Full     Port: Twisted Pair     PHYAD: 1     Transceiver: internal     Auto-negotiation: off     MDI-X: on (auto) 

Cannot get wake-on-lan settings: Operation not permitted Current message level: 0x00000007 (7) drv probe link Link detected: yes

I tried with another laptop and speed works at 1000 Mbps so why mine doesn’t since it was ok.