Jtdcftul

Upon bootup the network connection appears to be connected, for several reboots, I was shortly able to ping 8.8.8.8. However, I'm not longer able to do this. Then after logging in (<30 seconds) the network manager says the cable is disconnected. Unplugging and re-plugging the cable does not change this status.

The wireless connection is working.

I have previously used the wired connection in older versions of ubuntu (16.10 & 16.04) on this laptop, although I haven't tested them recently.

The network cable works with other computers.

The NIC device is a BCM5762.

Here is the output of ifconfig

    enp1s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500

        ether 40:b0:34:09:9a:c0  txqueuelen 1000  (Ethernet)

        RX packets 91  bytes 54152 (54.1 KB)

        RX errors 0  dropped 1  overruns 0  frame 0

        TX packets 146  bytes 32104 (32.1 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

        device interrupt 36  

    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 294  bytes 23870 (23.8 KB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 294  bytes 23870 (23.8 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 10.87.252.202  netmask 255.255.0.0  broadcast 10.87.255.255

        inet6 fe80::3260:ab36:9b89:9e58  prefixlen 64  scopeid 0x20<link>

        ether 7c:b0:c2:4e:13:d0  txqueuelen 1000  (Ethernet)

        RX packets 1247  bytes 1208923 (1.2 MB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 881  bytes 160559 (160.5 KB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Here is the output of lshw -C network

  *-network                 

       description: Ethernet interface

       product: NetXtreme BCM5762 Gigabit Ethernet PCIe

       vendor: Broadcom Limited

       physical id: 0

       bus info: pci@0000:01:00.0

       logical name: enp1s0

       version: 10

       serial: 40:b0:34:09:9a:c0

       capacity: 1Gbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm vpd msi msix pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 firmware=sb latency=0 link=no multicast=yes port=twisted pair

       resources: irq:36 memory:e0820000-e082ffff memory:e0810000-e081ffff memory:e0800000-e080ffff

  *-network

       description: Wireless interface

       product: Wireless 7265

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:02:00.0

       logical name: wlp2s0

       version: 59

       serial: 7c:b0:c2:4e:13:d0

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-23-generic firmware=29.1044073957.0 ip=10.87.252.202 latency=0 link=yes multicast=yes wireless=IEEE 802.11

       resources: irq:47 memory:e0d00000-e0d01fff

I had my network card get disabled after this morning's Ubuntu update. Rebooting the machine in Win10 the network card still works, so it's an Ubuntu configuration.

The way I solved it was the following:

sudo lshw -C network

This listed the "logical name" values:

logical name: enp8s0

logical name: docker0

logical name: enp0s29f7u7c4i2

I have a Dell T7400, so I know the device is a Broadcom NetXtreme BCM5754. Dell support provides no Ubuntu drivers, but you don't really need one. Somehow my ethernet device name was renamed.

sudo vi /etc/network/interfaces

Add the logical name to the end of the file:

auto enp8s0

iface enp8s0 inet dhcp

Finally, turn the interface on:

sudo ifup enp8s0

This is unhelpful. The file I have for 18.04.02 LTS says 'ifupdown has been replaced by netplan.'

I can't find a way for this thing to actually work. I suspect you have to define the netcard in the ridiculous yaml file [/etc/netplan/01-netcfg.yaml] and then define routing there as well (the man page uses an example but it's a bit tough to read the man page example AND edit the file when you have real hardware). Once all that is done, then you run [ip link set up enp2s0] or whatever your interface name is.

I can ping the card, but can't get to the default network because there is no route and no route policy out of the box (or it got deleted after I rebooted not realizing the cable was bad). It took a lot of googling to figure out how to even show the interface again. Who would even consider Ubuntu for anything important?

It's going backwards using yaml. Thanks ubuntu, thanks alot. Appropriate for stack overflow's April Fool's Day that's for sure. So much for upgrading from Ubuntu 8.

I've spent so much time trying to get 18.04.02 LTS to work that at this point I'm, going to have to consider an alternate distro (I'm running Ubuntu 8 LTS and it's solid, less the patch support). I initially had a bad hard drive connected, couldn't use the installer to fix the bad blocks (no fsck), had to end up booting to a much older linux distro to run badblocks on it. Which works great. Drive is usable again, no thanks to the installer.

What a waste of time. Guess I'll just go get CentOS and migrate to that. It's a shame, really. For a while there Ubuntu was good stuff.