I am very new to Ubuntu and am using 19.10. The wireless internet kept telling me my password was incorrect and the prompt to type it in was on an endless loop. I accidentally sudo modprobe -r iwlwifi and now my wifi has completely disappeared. I've been trying everything include sudo modprobe iwlwifi but have had no luck. When I type dmesg | grep iwl nothing happens. The only relevant information I have is sudo lshw -c network produces
*-network UNCLAIMED
description: Network controller
product: Cannon Point-LP CNVi [Wireless-AC]
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
version: 30
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix cap_list
configuration: latency=0
resources: memory:b431c000-b431ffff
*-network
description: Ethernet interface
physical id: 1
bus info: usb@1:6
logical name: enx00e04c6804d2
serial: 00:e0:4c:68:04:d2
size: 1Gbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.09.10 duplex=full ip=192.168.0.46 link=yes multicast=yes port=MII speed=1Gbit/s
EDIT
sudo modprobe iwlwifi This does nothing now
dmesg | grep iwl
[ 2.435843] Loading modules backported from iwlwifi
[ 2.435844] iwlwifi-stack-public:master:7906:7773a757
[ 2.502602] iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
[ 2.504534] iwlwifi 0000:00:14.3: Direct firmware load for iwl-dbg- cfg.ini failed with error -2
[ 2.507436] iwlwifi 0000:00:14.3: Found debug destination: EXTERNAL_DRAM
[ 2.507437] iwlwifi 0000:00:14.3: Found debug configuration: 0
[ 2.507924] iwlwifi 0000:00:14.3: loaded firmware version 46.6bf1df06.0 op_mode iwlmvm
[ 2.701211] iwlwifi 0000:00:14.3: Detected Intel(R) Dual Band Wireless AC 9560, REV=0x318
[ 2.708455] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[ 2.708920] iwlwifi 0000:00:14.3: Allocated 0x00400000 bytes for firmware monitor.
[ 2.753744] iwlwifi 0000:00:14.3: base HW address: d0:ab:d5:17:9e:f4
[ 2.825134] ieee80211 phy0: Selected rate control algorithm 'iwl- mvm-rs'
[ 2.827381] iwlwifi 0000:00:14.3 wlo1: renamed from wlan0
[ 4.637929] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[ 4.756187] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[ 4.824996] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[ 56.786408] iwlwifi 0000:00:14.3: Unhandled alg: 0x707
[ 56.786852] iwlwifi 0000:00:14.3: Unhandled alg: 0x707
[ 59.858918] iwlwifi 0000:00:14.3: Unhandled alg: 0x707
[ 59.860223] iwlwifi 0000:00:14.3: Unhandled alg: 0x707
lspci -nnk | grep 0280 -A3
00:14.3 Network controller [0280]: Intel Corporation Cannon Point-LP CNVi [Wireless-AC] [8086:9df0] (rev 30)
DeviceName: WLAN
Subsystem: Intel Corporation Cannon Point-LP CNVi [Wireless-AC] [8086:0034]
Kernel driver in use: iwlwifi
sudo dkms status
backport-iwlwifi, 7906, 5.0.0-1030-oem-osp1, x86_64: installed
backport-iwlwifi, 7906, 5.3.0-26-generic, x86_64: installed
nvidia, 430.50, 5.0.0-1030-oem-osp1, x86_64: installed
nvidia, 430.50, 5.3.0-26-generic, x86_64: installed
When you did the sudo modprobe -r iwlwifi you removed the wifi driver module from the kernel. Why did you do that? Don't ever type commands in the terminal if you're not 100% what they do.
To reload it, type sudo modprobe iwlwifi. Or, reboot the computer.
Regarding the wifi password, assure that your CAPS LOCK key is off, and assure that you're typing the correct password, including any upper/lower case letters. The password is case-sensitive. Assure that both sides of the wifi connection are using WPA2. Reset the wifi password if necessary.
Update #1:
Update #2:
You updated/upgraded the kernel from 5.0.0-1030-oem-osp1 to 5.3.0-26-generic.
dkms status shows us backport-iwlwifi.
sudo dkms remove backport-iwlwifi/7906 --all
reboot
Update #3:
And from Laptop cannot init iwlwifi we get:
wget http://security.ubuntu.com/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.183.2_all.deb
sudo dpkg -i linux*.deb
Thanks @chili555
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