Ask Ubuntu Asked by Amar Aryan on February 18, 2021
After I updated the kernel of my laptop to 5.4.13, No wifi adapter is found. So I tried the following steps:
sudo apt remove bcmwl-kernel-source && sudo apt install git dkms
git clone -b extended https://github.com/lwfinger/rtlwifi_new.git
sudo dkms add ./rtlwifi_new
sudo dkms install rtlwifi-new/0.6
But the fourth step shows the following errors :
Kernel preparation unnecessary for this kernel. Skipping...
Building module:
cleaning build area.....(bad exit status: 2)
make -j8 KERNELRELEASE=5.4.13-050413-generic -C /lib/modules/5.4.13-050413-generic/build M=/var/lib/dkms/rtlwifi-new/0.6/build.......(bad exit status: 2)
ERROR (dkms apport): binary package for rtlwifi-new: 0.6 not found
Error! Bad return status for module build on kernel: 5.4.13-050413-generic (x86_64)
Consult /var/lib/dkms/rtlwifi-new/0.6/build/make.log for more information.**
Please help. It’s being very difficult for me to work without wifi.
Thanks in advance for any help.
I did something similar to what Pilot6 says, but without downgrading (at least not a major/minor version downgrade).
I saw I had kernel 5.4.0-1025-gcp installed by running uname -r.
I ran sudo apt remove linux-image-5.4.0-1025-gcp and sudo apt remove linux-headers-5.4.0-1025-gcp.
Then I ran sudo apt install linux-generic to get the latest generic kernel.
I then rebooted with this kernel (5.4.0-48-generic).
Then sudo apt remove bcmwl-kernel-source and sudo apt purge bcmwl-kernel-source.
Finally sudo apt install bcmwl-kernel-source. It installed correctly for the generic header and now my wifi is working.
Answered by Jared Beach on February 18, 2021
Ubuntu doesn't use mainline Linux kernels. dkms drivers like bcmwl-kernel-source (Broadcom wirleless drivers) in Ubuntu repositories are supposed to build against Ubuntu kernels, not the mainline ones.
You installed a mainline unsupported kernel. Wi-Fi stopped working, that was predictable.
Then you removed a Broadcom driver and installed a Realtek driver for some reason. What did you expect to happen?
Broadcom proprietary drivers won't work on an unsuppoted kernel. Drivers from a completely different device won't help in any way.
rtlwifi_new won't build on the 5.4 kernel for the same reason.
The solution is to boot with an Ubuntu supported 5.3 kernel using grub menu and install bcmwl-kernel-source back if you have a Broadcom device.
Answered by Pilot6 on February 18, 2021
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