Public bug reported: 'No Wi-Fi Adapter Found' reported in Settings > WiFi.
rfkill lists only Bluetooth: $ rfkill list all 0: hci0: Bluetooth Soft blocked: no Hard blocked: no lspci identifies a wireless device: $ lspci 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15d0 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 15d1 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge 00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15d3 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15db 00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 15dc 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 61) 00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51) 00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e8 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15e9 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ea 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15eb 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ec 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ed 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ee 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 15ef 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15) 03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter 04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev c1) 04:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 15de 04:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Device 15df 04:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e0 04:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15e1 04:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Device 15e2 04:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Device 15e3 04:00.7 Non-VGA unclassified device: Advanced Micro Devices, Inc. [AMD] Device 15e6 05:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 61) And lshw reports that the wireless network controller is unclaimed: $ sudo lshw -C network [sudo] password for arin: *-network description: Ethernet interface product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:02:00.0 logical name: eno1 version: 15 serial: 80:e8:2c:bf:4e:96 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 firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII resources: irq:49 ioport:3000(size=256) memory:c0904000-c0904fff memory:c0900000-c0903fff *-network UNCLAIMED description: Network controller product: RTL8821CE 802.11ac PCIe Wireless Network Adapter vendor: Realtek Semiconductor Co., Ltd. physical id: 0 bus info: pci@0000:03:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress cap_list configuration: latency=0 resources: ioport:2000(size=256) memory:c0800000-c080ffff *-network description: Ethernet interface physical id: 2 logical name: enp4s0f3u2 serial: 6a:ba:16:cb:94:36 capabilities: ethernet physical configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.241 link=yes multicast=yes I've tried reinstalling bcmwl-kernel-source (sudo apt-get install --reinstall bcmwl-kernel-source) but it didn't work. This issue appeared after a boot into Windows 10 (my machine is dual- boot) in which the OS identified a 'boot error' and 'fixed' it in a black-box way. I've also disabled SecureBoot and cleared the SecureBoot log via the BIOS, but that didn't solve the problem either. Finally, when I booted Ubuntu using the 5.0.0-37-generic kernel rather than the 5.3.0-26-generic kernel, the WiFi worked normally. I'm not sure exactly which of the steps above was responsible for the problem, but I'm fairly convinced that the new kernel may have something to do with it. I should note that when I first installed Ubuntu on this machine on 2019-08-10, the WiFi didn't work out of the box and I ran these commands to get it to work: git clone https://github.com/tomaspinho/rtl8821ce cd rtl8821ce chmod +x dkms-install.sh chmod +x dkms-remove.sh sudo ./dkms-install.sh ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-5.3.0-26-generic 5.3.0-26.28~18.04.1 ProcVersionSignature: Ubuntu 5.3.0-26.28~18.04.1-generic 5.3.13 Uname: Linux 5.3.0-26-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.9-0ubuntu7.9 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Sun Jan 19 15:54:26 2020 InstallationDate: Installed on 2019-08-10 (161 days ago) InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) SourcePackage: linux-signed-hwe UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-signed-hwe (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1860280 Title: 'no wifi adapter found' in 5.3.0-26-generic with appropriate drivers present otherwise To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1860280/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs