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_22.214.171.124.1.30816.20190425-0ubuntu1_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 : 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"
I have a log from
journalctl -b if that helps.