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Thread: No Internet Connection on Ubuntu server after kernel update.

  1. #1
    Join Date
    Aug 2024
    Beans
    1

    Unhappy No Internet Connection on Ubuntu server after kernel update.

    I have done an update via sudo apt get update && sudo apt upgrade. I upgraded to Ubuntu 22.04.4 LTS.
    Also, I have upgraded the Kernel to GNU/Linux 6.5.0-1027-oracle aarch64.
    After the update, I wasn't able to access the Instance via SSH. I can only access the instance via cloud console.

    I don't know much about networking and have no idea how I can restore Internet access.
    I have googled a bit and done these things:

    ping 1.1.1.1
    Code:
    ping: connect: Network is unreachable
    dig askubuntu.com @1.1.1.1
    Code:
    ;; UDP setup with 1.1.1.1#53(1.1.1.1) for askubuntu.com failed: network unreachable.
    ;; no servers could be reached
    
    ;; UDP setup with 1.1.1.1#53(1.1.1.1) for askubuntu.com failed: network unreachable.
    ;; no servers could be reached
    
    ;; UDP setup with 1.1.1.1#53(1.1.1.1) for askubuntu.com failed: network unreachable.
    ;; no servers could be reached
    ip addr gives me the following output:
    Code:
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
        inet 127.0.0.1/8 scope host lo
           valid_lft forever preferred_lft forever
        inet6 ::1/128 scope host 
           valid_lft forever preferred_lft forever
    2: enp0s3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
        link/ether 02:00:17:00:e1:21 brd ff:ff:ff:ff:ff:ff
    3: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 500
        link/none 
        inet 10.8.0.1/24 scope global tun0
           valid_lft forever preferred_lft forever
        inet6 fe80::7e95:61d8:aa77:ad19/64 scope link stable-privacy 
           valid_lft forever preferred_lft forever
    4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
        link/ether 52:54:00:16:0b:c5 brd ff:ff:ff:ff:ff:ff
        inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
           valid_lft forever preferred_lft forever

    The Output of cat /etc/netplan/*.yaml:
    Code:
    network:
    version: 2
    renderer: networkd
    ethernets:
        enp0s3:
            dhcp4: true
    # This file is generated from information provided by the datasource.  Changes
    # to it will not persist across an instance reboot.  To disable cloud-init's
    # network configuration capabilities, write a file
    # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
    # network: {config: disabled}
    network:
        version: 2
        ethernets:
            enp0s3:
                dhcp4: true
                match:
                    macaddress: 02:00:17:00:e1:21
                set-name: enp0s3
    sudo lshw -C network:
    *-network                 
           description: Ethernet controller
           product: Virtio network device
           vendor: Red Hat, Inc.
           physical id: 3
           bus info: pci@0000:00:03.0
           version: 01
           width: 64 bits
           clock: 33MHz
           capabilities: msix bus_master cap_list
           configuration: driver=virtio-pci latency=0
           resources: iomemory:800-7ff irq:48 memory:13001000-13001fff memory:8003008000-800300bfff
         *-virtio1 DISABLED
              description: Ethernet interface
              physical id: 0
              bus info: virtio@1
              logical name: enp0s3
              serial: 02:00:17:00:e1:21
              capabilities: ethernet physical
              configuration: autonegotiation=off broadcast=yes driver=virtio_net driverversion=1.0.0 link=no multicast=yes

    sudo cat /etc/network/interfaces:
    Code:
    cat: /etc/network/interfaces: No such file or directory
    Has anyone an idea what I could do? Tank you very much!

  2. #2
    Join Date
    Mar 2010
    Location
    Been there, meh.
    Beans
    Hidden!
    Distro
    Ubuntu

    Re: No Internet Connection on Ubuntu server after kernel update.

    Your yaml file appears to be corrupted. Fix that.

    As a guess, it looks like the top 6 lines are repeated. Don't do that. If you just miscopied the file contents when posting here, then I have no idea.

    If you can't ping 1.1.1.1, you don't have any internet, so any internet related commands won't work (like dig).
    Last edited by TheFu; August 13th, 2024 at 03:05 PM.

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