In 4.15.0-13-generic, BCM4321 WiFi works via b43 and BCM4401-B0 b44
Ethernet eth0 exists. So, it seems this has been fixed. Thank you.

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  b44 Ethernet driver not working in Linux 4.15 on Inspiron 6400

Status in linux package in Ubuntu:
Status in linux source package in Bionic:

Bug description:
  When I boot linux-image-4.13.0-36-generic then I get an eth0 interface
  and dmesg output includes:

  ssb: Core 0 found: Fast Ethernet (cc 0x806, rev 0x07, vendor 0x42
  b44: Broadcom 44xx/47xx 10/100 PCI ethernet driver version 2.0
  b44 ssb1:0 eth0: Broadcom 44xx/47xx 10/100 PCI ethernet driver 00

  When I boot linux-image-4.15.0-10-generic those lines don't appear and
  I don't get an eth0 interface. Doing modprobe b44 doesn't help.

  This is on a Dell Inspiron 6400. I wonder if I'm running into this

  I'm reporting it while running linux-image-4.13.0-36-generic because I
  also can't get wireless to work in 4.15, so I can't report from there.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-10-generic 4.15.0-10.11
  ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC9200 Analog [STAC9200 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   /dev/snd/controlC0:  bgjenero   1449 F.... pulseaudio
   Card hw:0 'Intel'/'HDA Intel at 0xefffc000 irq 24'
     Mixer name : 'SigmaTel STAC9200'
     Components : 'HDA:83847690,102801bd,00102201 
     Controls      : 22
     Simple ctrls  : 9
  CurrentDesktop: XFCE
  Date: Sat Mar 10 20:55:15 2018
  HibernationDevice: RESUME=UUID=46f322d9-a161-4e1f-8a08-432d79aeac18
  InstallationDate: Installed on 2012-01-19 (2243 days ago)
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
   -- Logs begin at Sat 2018-03-10 18:57:57 EST, end at Sat 2018-03-10 20:55:01 
EST. --
   Mar 10 20:40:53 hostname wpa_supplicant[669]: dbus: 
wpa_dbus_get_object_properties: failed to get object properties: (none) none
   Mar 10 20:40:53 hostname wpa_supplicant[669]: dbus: Failed to construct 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Dell Inc. MM061
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-36-generic 
root=UUID=54eeb2ee-ee10-4c6b-9c61-1b790e52fd1e ro resume=/dev/sda6 nopti
   linux-restricted-modules-4.13.0-36-generic N/A
   linux-backports-modules-4.13.0-36-generic  N/A
   linux-firmware                             1.172
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-03-11 (0 days ago) 06/13/2007
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A17 0XD720
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvrA17:bd06/13/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0XD720:rvr:cvnDellInc.:ct8:cvr: MM061
  dmi.sys.vendor: Dell Inc.

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