This is my first question here, even if I've been lurking here for a long time.

I installed Ubuntu 21.04 next to windows 10 with hopes that a newer kernel would have better support for my problem. This was not the case.

  • I've disabled fastboot on windows 10 (in "power options").
  • I enabled the "Propietary drivers for devices (restricted)" sources when I installed.
  • I disabled secure boot.

Here is my system information:

$ uname -a
Linux aspire-A515-56 5.11.0-26-generic #28-Ubuntu SMP Thu Jul 15 19:27:01 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Here are my specs for my network hardware.

$ sudo lshw -class network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: enp1s0
       version: 15
       serial: 08:8f:c3:02:31:9e
       size: 1Gbit/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 driverversion=5.11.0-26-generic duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip= latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:16 ioport:3000(size=256) memory:52004000-52004fff memory:52000000-52003fff
  *-network UNCLAIMED
       description: Network controller
       product: MEDIATEK Corp.
       vendor: MEDIATEK Corp.
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm cap_list
       configuration: latency=0
       resources: iomemory:600-5ff iomemory:600-5ff iomemory:600-5ff memory:6003000000-60030fffff memory:6003100000-6003103fff memory:6003104000-6003104fff

And my rfkill feedback:

$ sudo rfkill list all
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
1: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
2: acer-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no

Thanks in advance for any insight that you can provide.

BTW: These are the sources I've looked into (and have not solved my problem):

  • 2
    "These are the sources I've looked into (and have not solved my problem)" You have not installed the 5.12 kernel as suggested. Please try it. Welcome to Ask Ubuntu.
    – chili555
    Aug 1 '21 at 13:30
  • Hello @chili555 you are right. I upgraded to 5.12 and rebooted and now I have wifi access. Should I delete this question?
    – pxi
    Aug 1 '21 at 13:57
  • No need to delete. I shall propose an answer that I hope you will accept. The searchers will appreciate it!
    – chili555
    Aug 1 '21 at 16:04

The Mediatek 7921 is recognized in kernel versions 5.12 and newer. With a working internet connection by ethernet, tethering or whatever means possible, open a terminal and do:

wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-headers-5.12.5-051205-generic_5.12.5-051205.202105190541_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-headers-5.12.5-051205_5.12.5-051205.202105190541_all.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-image-unsigned-5.12.5-051205-generic_5.12.5-051205.202105190541_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.12.5/amd64/linux-modules-5.12.5-051205-generic_5.12.5-051205.202105190541_amd64.deb
sudo dpkg -i linux*.deb

Reboot and your wireless should now be working. You may need to disable Secure Boot in the BIOS/EFI.

  • Good point on that disabling secure boot. I had forgotten to mention I did that too, so I've added that to my original question.
    – pxi
    Aug 3 '21 at 8:28
  • Is there any way to install these without needing to disable secure boot?
    – 2br-2b
    Aug 12 '21 at 23:34
  • You can install them without disabling secure boot; however the wireless may or may not actually work once booted into kernel version 5.12.5 without disabling secure boot. Please try it and advise.
    – chili555
    Aug 13 '21 at 0:22

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.