No wifi adapter found on Ubuntu 20.04.3 LTS

Question

I have found a lots of answers of this question, but none of these worked for me. This problem occurred after a fresh installation on my MSI modern 15 (Ryzen 5 5500U) laptop.

Output of sudo lshw -C network command :

  *-network UNCLAIMED       
       description: Network controller
       product: MEDIATEK Corp.
       vendor: MEDIATEK Corp.
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm cap_list
       configuration: latency=0
       resources: memory:e0300000-e03fffff memory:e0400000-e0403fff memory:e0404000-e0404fff
  *-network
       description: Ethernet interface
       physical id: 1
       bus info: usb@3:2
       logical name: usb0
       serial: f6:2d:03:39:54:21
       capabilities: ethernet physical
       configuration: broadcast=yes driver=rndis_host driverversion=5.11.0-41-generic firmware=RNDIS device link=yes multicast=yes

Output of 'lspci' command

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Renoir IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe GPP Bridge
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Renoir Internal PCIe GPP Bridge to Bus
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 51)
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] Renoir Device 24: Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Renoir Device 24: Function 7
01:00.0 Network controller: MEDIATEK Corp. Device 0608
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
03:00.0 Non-Volatile memory controller: Micron Technology Inc Device 5404 (rev 03)
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 164c (rev c2)
04:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Device 1637
04:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor
04:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
04:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir USB 3.1
04:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor (rev 01)
04:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller

Output of lspci -vvnn | grep -A 9 Network command :

01:00.0 Network controller [0280]: MEDIATEK Corp. Device [14c3:0608]
    Subsystem: MEDIATEK Corp. Device [14c3:0608]
    Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Interrupt: pin A routed to IRQ 255
    Region 0: Memory at e0300000 (64-bit, prefetchable) [disabled] [size=1M]
    Region 2: Memory at e0400000 (64-bit, prefetchable) [disabled] [size=16K]
    Region 4: Memory at e0404000 (64-bit, prefetchable) [disabled] [size=4K]
    Capabilities: <access denied>

Output of modinfo mt7921e | grep alias command :

alias:          pci:v000014C3d00007961sv*sd*bc*sc*i*

For your information : I disabled the secure boot & fast boot options when installing, as many people have faced problems like 'no wifi adapter found' by enabling them.

It will be really helpful for me, if any of you guys can tell me what Can I do now ?

Update : Removed the incorrect Broadcom Driver (Kernel modules: wl is gone from lspci -vvnn command)

Update2 : I have followed the answer given by chili555 accordingly, and phew... ! that worked. Thank you awesome people.

Answer 1

MEDIATEK Corp. Device [14c3:0608]

This specific pci.id has recently been added to the aliases of the driver mt7921e. Reference: https://www.spinics.net/lists/linux-wireless/msg217303.html

Until this patch reaches a standard Ubuntu kernel, we may, as you've proven, add the pci.id with a udev action. From the terminal:

sudo nano /etc/modprobe.d/mt7921e.conf

Add a single line to this new file:

alias pci:v000014C3d00000608sv*sd*bc*sc*i* mt7921e

Proofread carefully. Save (Ctrl+o followed by Enter) and exit (Ctrl+x followed by Enter) the text editor nano.

Next, do:

sudo nano /etc/udev/rules.d/99-mt7921e.rules

Add a single line:

SUBSYSTEM=="drivers", DEVPATH=="/bus/pci/drivers/mt7921e", ATTR{new_id}="14c3 0608"

Proofread carefully, save and exit as above.

Your wireless should now work as expected. To confirm, please test with a reboot.