Gfilui

I have recently installed Ubuntu 18.04 LTS, but I wouldn't get connected to the wifi as there was no wifi option. I checked /lib/firmware and my Intel AC 9260 wifi driver ucode was there, I tried downloading another one from Intel too but that didn't make a difference.

nvan@R2700x:~$ lspci -nnk | grep 0280 -A3`
 06:00.0 Network controller [0280]: Intel Corporation Device [8086:2526] (rev 29)
 Subsystem: Intel Corporation Device [8086:0014]
 Kernel driver in use: iwlwifi
 Kernel modules: iwlwifi

nvan@R2700x:~$ dmesg | grep iwl
[ 4.583006] iwlwifi 0000:06:00.0: enabling device (0000 -> 0002)
[ 4.596295] iwlwifi 0000:06:00.0: loaded firmware version 34.0.0 op_mode iwlmvm
[ 4.615392] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 9260, REV=0x324
[ 4.622171] kernel BUG at /build/linux-5s7Xkn/linux-4.15.0/drivers/net/wireless/intel/iwlwifi/pcie/rx.c:425!
[ 4.622216] Modules linked in: snd_hda_intel amd64_edac_mod(-) snd_hda_codec iwlmvm(+) snd_hda_core edac_mce_amd kvm_amd(-) snd_hwdep mac80211 kvm snd_pcm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc snd_seq_midi snd_seq_midi_event snd_rawmidi iwlwifi aesni_intel aes_x86_64 crypto_simd glue_helper cryptd wmi_bmof snd_seq cfg80211 input_leds btusb snd_seq_device btrtl snd_timer btbcm btintel snd bluetooth soundcore ccp k10temp ecdh_generic mac_hid shpchp sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic usbhid hid nouveau mxm_wmi video ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops igb drm dca i2c_piix4 i2c_algo_bit ptp nvme ahci pps_core libahci nvme_core gpio_amdpt wmi gpio_generic
[ 4.622335] RIP: 0010:iwl_pcie_rxq_alloc_rbs+0x1d0/0x1f0 [iwlwifi]
[ 4.622403] _iwl_pcie_rx_init+0x252/0x710 [iwlwifi]
[ 4.622414] iwl_pcie_rx_init+0x2d/0x3c0 [iwlwifi]
[ 4.622436] ? iwl_mvm_nic_config+0xeb/0x120 [iwlmvm]
[ 4.622448] iwl_trans_pcie_start_fw+0x2a1/0x6c0 [iwlwifi]
[ 4.622462] iwl_mvm_load_ucode_wait_alive+0xec/0x2b0 [iwlmvm]
[ 4.622490] iwl_run_init_mvm_ucode+0x8e/0x330 [iwlmvm]
[ 4.622500] ? iwl_run_init_mvm_ucode+0x8e/0x330 [iwlmvm]
[ 4.622510] ? iwl_wait_init_complete+0x20/0x20 [iwlmvm]
[ 4.622523] iwl_op_mode_mvm_start+0x649/0x920 [iwlmvm]
[ 4.622536] ? iwl_op_mode_mvm_start+0x649/0x920 [iwlmvm]
[ 4.622546] _iwl_op_mode_start.isra.10+0x4c/0xa0 [iwlwifi]
[ 4.622556] iwl_opmode_register+0x75/0xe0 [iwlwifi]
[ 4.622573] iwl_mvm_init+0x38/0x1000 [iwlmvm]
[ 4.622739] RIP: iwl_pcie_rxq_alloc_rbs+0x1d0/0x1f0 [iwlwifi] RSP: ffffadbfc23fb8a8

Thank you for your help!

Sincerely,

Nick V

Update 1:
I have tried to install the BackPort from this site backport-iwlwifi
. However, I'm unable to install it due to lack of gcc. I also tried to install build-essential package, but without an internet connection, I'm clueless about how to proceed.

Please start with:

sudo apt update
sudo apt install build-essential git

Now do:

git clone https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git
cd backport-iwlwifi
sudo make
sudo make install

The ‘make’ step takes a few moments; please be patient.

Now, we’ll write a conf file:

sudo -i
echo “options iwlwifi disable_msix=1” >> /etc/modprobe.d/iwlwifi.conf
exit

Reboot and tell us if the wireless is now working.

EDIT: You have compiled the driver for your currently running kernel version only. When Update Manager installs a newer kernel version, after the requested reboot, recompile:

cd backport-iwlwifi
sudo make clean
sudo make
sudo make install

Reboot.

Please retain the files and these instructions for that time.

Lets start with the easy options. I presume you haven't turned the card off in the network settings, but what about the hardware kill switch?

andrew@big-red-wired:~$ rfkill
ID TYPE DEVICE SOFT HARD
 0 wlan phy0 blocked unblocked
andrew@big-red-wired:~$ 

In my case, I have one wireless card, and I have it off in software, ON in the hardware. All I did was use Network Manager to disable the wireless. I got bit by this a few years back reinstalling for a friend who had a borked windows install and this was the problem.

HTH
Andrew.

edit:
If this is indeed the case,

rfkill unblock all