As I said in my comment #2 there are a lot of missing modules between
kernel 4.4.0-67 and 4.4.0-66 (working). One of this is the wifi module.

Follow the output of requested commands, also the output of "modprobe
iwlwifi" that as I said before failed:

gmellini@goblinshark:~$ uname -a
Linux goblinshark 4.4.0-67-generic #88-Ubuntu SMP Wed Mar 8 16:34:45 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux
gmellini@goblinshark:~$ lspci -nnk
00:00.0 Host bridge [0600]: Intel Corporation 3rd Gen Core processor DRAM 
Controller [8086:0154] (rev 09)
        Subsystem: Toshiba America Info Systems 3rd Gen Core processor DRAM 
Controller [1179:0001]
        Kernel driver in use: ivb_uncore
00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core 
processor Graphics Controller [8086:0166] (rev 09)
        Subsystem: Toshiba America Info Systems 3rd Gen Core processor Graphics 
Controller [1179:0004]
00:14.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset 
Family USB xHCI Host Controller [8086:1e31] (rev 04)
        Subsystem: Toshiba America Info Systems 7 Series/C210 Series Chipset 
Family USB xHCI Host Controller [1179:0001]
        Kernel driver in use: xhci_hcd
00:16.0 Communication controller [0780]: Intel Corporation 7 Series/C210 Series 
Chipset Family MEI Controller #1 [8086:1e3a] (rev 04)
        Subsystem: Toshiba America Info Systems 7 Series/C210 Series Chipset 
Family MEI Controller [1179:0001]
00:19.0 Ethernet controller [0200]: Intel Corporation 82579V Gigabit Network 
Connection [8086:1503] (rev 04)
        Subsystem: Toshiba America Info Systems 82579V Gigabit Network 
Connection [1179:0002]
        Kernel driver in use: e1000e
        Kernel modules: e1000e
00:1a.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset 
Family USB Enhanced Host Controller #2 [8086:1e2d] (rev 04)
        Subsystem: Toshiba America Info Systems 7 Series/C210 Series Chipset 
Family USB Enhanced Host Controller [1179:0001]
        Kernel driver in use: ehci-pci
00:1b.0 Audio device [0403]: Intel Corporation 7 Series/C210 Series Chipset 
Family High Definition Audio Controller [8086:1e20] (rev 04)
        Subsystem: Toshiba America Info Systems 7 Series/C210 Series Chipset 
Family High Definition Audio Controller [1179:0001]
00:1c.0 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series Chipset 
Family PCI Express Root Port 1 [8086:1e10] (rev c4)
        Kernel driver in use: pcieport
00:1c.2 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series Chipset 
Family PCI Express Root Port 3 [8086:1e14] (rev c4)
        Kernel driver in use: pcieport
00:1d.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series Chipset 
Family USB Enhanced Host Controller #1 [8086:1e26] (rev 04)
        Subsystem: Toshiba America Info Systems 7 Series/C210 Series Chipset 
Family USB Enhanced Host Controller [1179:0001]
        Kernel driver in use: ehci-pci
00:1f.0 ISA bridge [0601]: Intel Corporation HM76 Express Chipset LPC 
Controller [8086:1e59] (rev 04)
        Subsystem: Toshiba America Info Systems HM76 Express Chipset LPC 
Controller [1179:0001]
00:1f.2 SATA controller [0106]: Intel Corporation 7 Series Chipset Family 
6-port SATA Controller [AHCI mode] [8086:1e03] (rev 04)
        Subsystem: Toshiba America Info Systems 7 Series Chipset Family 6-port 
SATA Controller [AHCI mode] [1179:0001]
        Kernel driver in use: ahci
        Kernel modules: ahci
01:00.0 System peripheral [0880]: Ricoh Co Ltd PCIe SDXC/MMC Host Controller 
[1180:e823] (rev 07)
        Subsystem: Toshiba America Info Systems PCIe SDXC/MMC Host Controller 
[1179:0001]
02:00.0 Network controller [0280]: Intel Corporation Centrino Wireless-N 2230 
[8086:0887] (rev c4)
        Subsystem: Intel Corporation Centrino Wireless-N 2230 BGN [8086:4062]
gmellini@goblinshark:~$ find /lib/modules/ | grep iwlwifi.ko
/lib/modules/4.4.0-64-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
/lib/modules/4.4.0-66-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
gmellini@goblinshark:~$ 
gmellini@goblinshark:~$ sudo modprobe iwlwifi
[sudo] password di gmellini: 
modprobe: ERROR: ../libkmod/libkmod-module.c:832 kmod_module_insert_module() 
could not find module by name='iwlwifi'
modprobe: ERROR: could not insert 'iwlwifi': Unknown symbol in module, or 
unknown parameter (see dmesg)
gmellini@goblinshark:~$

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https://bugs.launchpad.net/bugs/1674109

Title:
  network connection (wired and wireless) completely broken after
  upgrading to 4.4.0-67 kernel - Ubuntu 16.04 64bit

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