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:~$ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 Status in linux package in Ubuntu: Confirmed Bug description: Hi, I did an upgrade of my Ubuntu 16.04 and I installed last available kernel 4.4.0-67-generic. My wifi won't work anymore (I had to boot with 4.4.0-66-generic that is working fine). This is my lspci gmellini@goblinshark:~$ lspci 00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) 00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04) 00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579V Gigabit Network Connection (rev 04) 00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4) 00:1c.2 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 3 (rev c4) 00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04) 01:00.0 System peripheral: Ricoh Co Ltd PCIe SDXC/MMC Host Controller (rev 07) 02:00.0 Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4) gmellini@goblinshark:~$ Let me know if you need more info, this is a breaking regression Giovanni To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674109/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp