Wifi adapter not found, rtl8821ce no longer working [18.04]
When I installed ubuntu 18.04 on my HP Pavilion 15z 6 months ago, I had trouble getting the wifi driver to work. Installing the rtl8821ce repo from this post solved my problem. 6 months later, I'm having trouble again with the "No wifi adapter found". I booted into my Windows 10 and the wifi works, so my wifi card is fine.
I uninstalled and reinstalled the rt18821ce from the kernel with no problems.
cd rtl8821ce/
sudo ./dkms-remove.sh
sudo /dkms-install.sh
Then rebooted, but still no connection to wifi card.
Following the instructions on this post, I removed the rt18821ce and then installed official ubuntu package.
sudo dpkg -i rtl8821ce-dkms_5.2.5.2.1.30816.20190425-0ubuntu1_all.deb
Rebooted, still have the issue.
Here's information on the details of my network card.
sudo lshw -C network
*-network UNCLAIMED
description: Network controller
product: RTL8821CE 802.11ac PCIe Wireless Network Adapter
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list
configuration: latency=0
resources: ioport:f000(size=256) memory:fe900000-fe90ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:03:00.0
logical name: eno1
version: 15
serial: f8:b4:6a:a7:75:ff
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 duplex=half firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:47 ioport:e000(size=256) memory:fe804000-fe804fff memory:fe800000-fe803fff
lspci -nnk | grep -A2 0280
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]
Subsystem: Hewlett-Packard Company RTL8821CE 802.11ac PCIe Wireless Network Adapter [103c:831a]
Kernel modules: rtl8821ce
dmesg | grep -i firmware
[ 0.474628] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 1.328217] acpi PNP0A08:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[ 2.721778] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x4d5f02)
[ 4.700397] Bluetooth: hci0: RTL: rtl: assuming no firmware upload needed
[ 4.842078] [drm] Found VCN firmware Version: 1.73 Family ID: 18
[ 4.842083] [drm] PSP loading VCN firmware
[ 120.770143] usb 1-2.3: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
kernel version 5.0.0-37-generic
I have a log from journalctl -b
if that helps.
The issue was that BIOS Secure Boot was On.
Even though I did turn off Secure Boot 6 months ago, my BIOS settings reset to default(maybe it updated?), so I had to turn it off again.