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Thread: Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

  1. #1
    Join Date
    Oct 2014
    Beans
    16

    Exclamation Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

    Hi,

    I use Ubuntu 20.04.3 LTS and moving to another office that has a wired cable I failed to connect to the network with my laptop. It seems dead, the light in router does not open.I try the same wired port/cable in another laptop and the network is working fine. The wireless card works in my laptop

    Code:
    sudo ip link show
      1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
         link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      2: enp3s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
         link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
      3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
         link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff

    From the Settings/Network I create a wired connection but Cable is unplugged:




    So I removed it

    Searching a bit I found mentions about

    Code:
    /etc/netplan/01-network-manager-all.yaml
    The original file is:

    Code:
    network:
      version: 2
      renderer: NetworkManager
    I change to
    Code:
    network:
        version: 2
        renderer: NetworkManager
        ethernets:
          enp3s0:
          dhcp4: true
    and give sudo netplan apply. Still cable unlugged

    I also restart NetworkManager (sudo service network-manager restart) but still nothing wired network does not work
    I read mentions about /etc/network/interfaces but there is no such file in my Ubuntu
    I tried sudo ifconfig enp3s0 up but still cable unplugged
    Try reboot, etc but all fails


    Hardware details:
    Code:
    lspci
    
     02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
         Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020e]
         Kernel driver in use: ath9k
         Kernel modules: ath9k
    
     03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller [10ec:8136] (rev 07)
         Subsystem: Dell RTL810xE PCI Express Fast Ethernet controller [1028:078a]
         Kernel driver in use: r8169
         Kernel modules: r8169
    Code:
    ifconfig
    
     enp3s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
             ether xx:xx:xx:xx:xx:xx  txqueuelen 1000  (Ethernet)
             RX packets 0  bytes 0 (0.0 B)
             RX errors 0  dropped 0  overruns 0  frame 0
             TX packets 0  bytes 0 (0.0 B)

    There are similar threads: https://ubuntuforums.org/showthread....ight=unplugged, https://ubuntuforums.org/showthread....ight=unplugged but no solution.


    Could someone help?

    Thanks
    Attached Images Attached Images

  2. #2
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
    7,929
    Distro
    Ubuntu Mate 20.04 Focal Fossa

    Re: Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

    Please show the outputs of these commands:
    Code:
    sudo ethtool enp3s0
    cat /etc/network/interfaces
    lsmod

  3. #3
    Join Date
    Oct 2014
    Beans
    16

    Exclamation Re: Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

    Quote Originally Posted by praseodym View Post
    Please show the outputs of these commands:
    Code:
    sudo ethtool enp3s0
    cat /etc/network/interfaces
    lsmod
    Hi praseodym,

    As I mentioned, I have no /etc/network/interfaces file:

    Code:
    cat: /etc/network/interfaces: No such file or directory
    This is a new Ubuntu 20.04 installation (some months old), but never checked wired card just few days ago as I worked until now with WIFI. On same laptop with previous Ubuntu version: 16.04 Ethernet with cable was working fine.

    The cable is plugged in my router and laptop but nothing works. I checked on another laptop same router and cable and eveything work fine.

    sudo apt-get install ethtool
    sudo ethtool enp3s0
    Code:
    Settings for enp3s0:
      Supported ports: [ TP MII ]
      Supported link modes:   10baseT/Half 10baseT/Full 
                              100baseT/Half 100baseT/Full 
      Supported pause frame use: Symmetric Receive-only
      Supports auto-negotiation: Yes
      Supported FEC modes: Not reported
      Advertised link modes:  10baseT/Half 10baseT/Full 
                              100baseT/Half 100baseT/Full 
      Advertised pause frame use: Symmetric Receive-only
      Advertised auto-negotiation: Yes
      Advertised FEC modes: Not reported
      Speed: Unknown!
      Duplex: Unknown! (255)
      Port: Twisted Pair
      PHYAD: 0
      Transceiver: internal
      Auto-negotiation: on
      MDI-X: Unknown
      Supports Wake-on: pumbg
      Wake-on: d
      Link detected: no

    sudo ethtool -i enp3s0
    Code:
    driver: r8169
    version: 5.11.0-27-generic
    firmware-version: rtl8106e-1_0.0.1 06/29/12
    expansion-rom-version: 
    bus-info: 0000:03:00.0
    supports-statistics: yes
    supports-test: no
    supports-eeprom-access: no
    supports-register-dump: yes
    supports-priv-flags: no

    lsmod
    Code:
    Module                  Size  Used by
    rfcomm                 81920  4
    vboxnetadp             28672  0
    vboxnetflt             28672  0
    vboxdrv               516096  2 vboxnetadp,vboxnetflt
    ccm                    20480  3
    cmac                   16384  2
    algif_hash             16384  1
    algif_skcipher         16384  1
    af_alg                 28672  6 algif_hash,algif_skcipher
    bnep                   24576  2
    nls_iso8859_1          16384  1
    snd_soc_skl           159744  0
    snd_soc_sst_ipc        20480  1 snd_soc_skl
    snd_soc_sst_dsp        36864  1 snd_soc_skl
    snd_hda_ext_core       32768  1 snd_soc_skl
    snd_soc_acpi_intel_match    49152  1 snd_soc_skl
    snd_soc_acpi           16384  2 snd_soc_acpi_intel_match,snd_soc_skl
    snd_hda_codec_hdmi     61440  1
    snd_hda_codec_realtek   135168  1
    snd_hda_codec_generic    81920  1 snd_hda_codec_realtek
    snd_hda_intel          53248  3
    snd_intel_dspcfg       28672  2 snd_hda_intel,snd_soc_skl
    soundwire_intel        40960  1 snd_intel_dspcfg
    soundwire_generic_allocation    16384  1 soundwire_intel
    soundwire_cadence      32768  1 soundwire_intel
    snd_hda_codec         147456  4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
    snd_hda_core           94208  7 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_soc_skl
    snd_hwdep              16384  1 snd_hda_codec
    soundwire_bus          77824  3 soundwire_intel,soundwire_generic_allocation,soundwire_cadence
    snd_soc_core          286720  2 soundwire_intel,snd_soc_skl
    snd_compress           28672  1 snd_soc_core
    ac97_bus               16384  1 snd_soc_core
    snd_pcm_dmaengine      16384  1 snd_soc_core
    amdgpu               6053888  0
    snd_pcm               114688  9 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,soundwire_intel,snd_compress,snd_soc_core,snd_soc_skl,snd_hda_core,snd_pcm_dmaengine
    snd_seq_midi           20480  0
    snd_seq_midi_event     16384  1 snd_seq_midi
    snd_rawmidi            36864  1 snd_seq_midi
    iommu_v2               24576  1 amdgpu
    snd_seq                73728  2 snd_seq_midi,snd_seq_midi_event
    gpu_sched              40960  1 amdgpu
    snd_seq_device         16384  3 snd_seq,snd_seq_midi,snd_rawmidi
    snd_timer              40960  2 snd_seq,snd_pcm
    snd                    94208  19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_compress,snd_soc_core,snd_pcm,snd_rawmidi
    soundcore              16384  1 snd
    ath3k                  24576  0
    mei_hdcp               24576  0
    btusb                  61440  0
    btrtl                  24576  1 btusb
    btbcm                  16384  1 btusb
    intel_rapl_msr         20480  0
    btintel                28672  1 btusb
    bluetooth             638976  32 btrtl,btintel,btbcm,bnep,ath3k,btusb,rfcomm
    x86_pkg_temp_thermal    20480  0
    ath9k                 151552  0
    dell_laptop            24576  0
    intel_powerclamp       20480  0
    coretemp               20480  0
    kvm_intel             294912  0
    ecdh_generic           16384  1 bluetooth
    ecc                    32768  1 ecdh_generic
    ledtrig_audio          16384  2 snd_hda_codec_generic,dell_laptop
    ath9k_common           36864  1 ath9k
    uvcvideo               98304  0
    dell_smm_hwmon         20480  0
    kvm                   819200  1 kvm_intel
    crct10dif_pclmul       16384  1
    ghash_clmulni_intel    16384  0
    aesni_intel           372736  5
    rtsx_usb_ms            24576  0
    ath9k_hw              483328  2 ath9k_common,ath9k
    radeon               1474560  1
    crypto_simd            16384  1 aesni_intel
    cryptd                 24576  3 crypto_simd,ghash_clmulni_intel
    ath                    36864  3 ath9k_common,ath9k,ath9k_hw
    memstick               24576  1 rtsx_usb_ms
    drm_ttm_helper         16384  2 amdgpu,radeon
    mac80211             1024000  1 ath9k
    i915                 2297856  20
    ttm                    73728  3 amdgpu,radeon,drm_ttm_helper
    input_leds             16384  0
    cfg80211              888832  4 ath9k_common,ath9k,ath,mac80211
    serio_raw              20480  0
    drm_kms_helper        237568  3 amdgpu,radeon,i915
    glue_helper            16384  1 aesni_intel
    rapl                   20480  0
    cec                    53248  2 drm_kms_helper,i915
    mei_me                 40960  1
    intel_cstate           20480  0
    libarc4                16384  1 mac80211
    dell_wmi               20480  0
    dell_smbios            28672  2 dell_wmi,dell_laptop
    intel_hid              24576  0
    ee1004                 20480  0
    dcdbas                 20480  1 dell_smbios
    processor_thermal_device    20480  0
    efi_pstore             16384  0
    rc_core                61440  1 cec
    processor_thermal_rfim    16384  1 processor_thermal_device
    sparse_keymap          16384  2 intel_hid,dell_wmi
    intel_xhci_usb_role_switch    16384  0
    processor_thermal_mbox    16384  1 processor_thermal_device
    processor_thermal_rapl    20480  1 processor_thermal_device
    intel_rapl_common      24576  2 intel_rapl_msr,processor_thermal_rapl
    mei                   122880  3 mei_hdcp,mei_me
    dell_wmi_descriptor    20480  2 dell_wmi,dell_smbios
    joydev                 24576  0
    i2c_algo_bit           16384  3 amdgpu,radeon,i915
    fb_sys_fops            16384  1 drm_kms_helper
    syscopyarea            16384  1 drm_kms_helper
    sysfillrect            16384  1 drm_kms_helper
    sysimgblt              16384  1 drm_kms_helper
    wmi_bmof               16384  0
    mac_hid                16384  0
    int3400_thermal        20480  0
    int340x_thermal_zone    20480  1 processor_thermal_device
    intel_pch_thermal      20480  0
    acpi_thermal_rel       16384  1 int3400_thermal
    intel_soc_dts_iosf     20480  1 processor_thermal_device
    acpi_pad              184320  0
    nf_log_ipv6            16384  5
    ip6t_REJECT            16384  1
    nf_reject_ipv6         20480  1 ip6t_REJECT
    xt_hl                  16384  22
    ip6t_rt                20480  3
    nf_log_ipv4            16384  5
    nf_log_common          16384  2 nf_log_ipv4,nf_log_ipv6
    ipt_REJECT             16384  1
    nf_reject_ipv4         16384  1 ipt_REJECT
    xt_LOG                 20480  10
    xt_limit               16384  13
    xt_addrtype            16384  4
    xt_tcpudp              20480  18
    xt_conntrack           16384  16
    nf_conntrack          147456  1 xt_conntrack
    nf_defrag_ipv6         24576  1 nf_conntrack
    nf_defrag_ipv4         16384  1 nf_conntrack
    sch_fq_codel           20480  2
    libcrc32c              16384  1 nf_conntrack
    msr                    16384  0
    ip6table_filter        16384  1
    ip6_tables             32768  53 ip6table_filter
    iptable_filter         16384  1
    parport_pc             45056  0
    bpfilter               16384  0
    ppdev                  24576  0
    lp                     20480  0
    parport                65536  3 parport_pc,lp,ppdev
    drm                   548864  13 gpu_sched,drm_kms_helper,amdgpu,radeon,drm_ttm_helper,i915,ttm
    ip_tables              32768  9 iptable_filter
    x_tables               49152  13 ip6table_filter,xt_conntrack,iptable_filter,xt_LOG,xt_tcpudp,xt_addrtype,ip6t_rt,ip6_tables,ipt_REJECT,ip_tables,xt_limit,xt_hl,ip6t_REJECT
    autofs4                45056  2
    rtsx_usb_sdmmc         32768  0
    rtsx_usb               28672  2 rtsx_usb_sdmmc,rtsx_usb_ms
    usbhid                 57344  0
    hid_rmi                24576  0
    rmi_core               86016  1 hid_rmi
    videobuf2_vmalloc      20480  2 rmi_core,uvcvideo
    videobuf2_memops       20480  1 videobuf2_vmalloc
    videobuf2_v4l2         32768  2 rmi_core,uvcvideo
    videobuf2_common       61440  3 rmi_core,videobuf2_v4l2,uvcvideo
    videodev              245760  4 rmi_core,videobuf2_v4l2,uvcvideo,videobuf2_common
    mc                     57344  4 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common
    hid_generic            16384  0
    crc32_pclmul           16384  0
    ahci                   40960  2
    r8169                  77824  0
    intel_lpss_pci         20480  0
    intel_lpss             16384  1 intel_lpss_pci
    idma64                 20480  0
    i2c_hid                32768  0
    realtek                28672  1
    i2c_i801               32768  0
    xhci_pci               20480  0
    i2c_smbus              20480  1 i2c_i801
    wmi                    32768  4 dell_wmi,wmi_bmof,dell_smbios,dell_wmi_descriptor
    libahci                36864  1 ahci
    psmouse               155648  0
    xhci_pci_renesas       20480  1 xhci_pci
    virt_dma               20480  1 idma64
    hid                   135168  4 i2c_hid,usbhid,hid_generic,hid_rmi
    pinctrl_sunrisepoint    28672  0
    video                  49152  3 dell_wmi,dell_laptop,i915
    Thank you
    Last edited by iqdesigner; September 7th, 2021 at 07:07 PM.

  4. #4
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
    7,929
    Distro
    Ubuntu Mate 20.04 Focal Fossa

    Re: Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

    Link detected: no

    Cable broken?

  5. #5
    Join Date
    Sep 2011
    Location
    Pennsylvania, U.S.A.
    Beans
    2,986
    Distro
    Ubuntu Development Release

    Re: Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

    I have an inexpensive TP-Link ethernet-USB adapter for just such occasions. I know it's plug and play. If the built-in ethernet port doesn't work I'll try the USB-ethernet adapter. If the USB adapter works something is going on with the built-in port, either hardware or software. If neither ethernet port works I'd look long and hard at the router/cable. If the machine's port isn't working I might try booting a live USB drive and see if I have ethernet with that. If the live USB ethernet works, there is probably some sort of configuration problem with the installed OS.

  6. #6
    Join Date
    Oct 2014
    Beans
    16

    Re: Ubuntu 20.04.03 Ethernet adapter – Wired cable unplugged

    I tried with another laptop on same cable/router and network works. So the cable/router works
    I put a live CD and still have no network.
    I suppose that while my Ethernet card is identified actually is broken. Is this possible?

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