[Installation] I installed Kubuntu on my old MacBook Air with dual boot, but the internet doesn't work.

[mellllonsoda]

I have a Macbook Air Early 2014 (MacOS version is Big sur).
I also downloaded Kubuntu with dual boot.
However, because there is no driver, it is not possible to connect to the Internet. How can I connect? thank you.
(I have a TP-Link Archer T2U nano, so connecting via that is also fine.)

[Snowhog]

Welcome to KFN.

Wi-fi should 'just work' on an Apple computer. Apple doesn't use a proprietary wi-fi chip.

Reboot from the LiveUSB you created (assuming that's what you used) and select the Try Kubuntu. Wireless should work fine, and that's just to confirm my assertion. If it does (it should), then we just have to look at Network Managers network connection for the wi-fi signal you are trying to connect to on the installed Kubuntu.

[claydoh]

Apple doesn't use a proprietary wi-fi chip.

Not so sure about that - Broadcom wifi 4360?

I'd look at the Driver Manager and see if it offers the needed driver.

https://www.reddit.com/r/linuxquesti...015_model_and/
which is based on the much more thorough and long post on general broadcom wifi (and appears actively maintained and updated)
https://askubuntu.com/questions/5586...reless-drivers

[mellllonsoda]

Thank you for your welcome.
I checked the chips with lspci and lsusb and it appears that the Wi-Fi dongle is RTL8812au and the built-in card is Broadcom Wi-Fi 4360.
I was able to find the driver on GitHub.
However, I cannot compile it because I do not have build-essential or DKMS.
What should I do? Thank you in advance.
I forgot to mention that I am a Japanese speaker and am posting this using Google Translate and my own limited knowledge, so I apologize if there are any mistakes in English.

[acheron]

However, I cannot compile it because I do not have build-essential or DKMS.

They are on the installation ISO. Either with the ISO as a package source, or by finding the packages in the pool directory.

[mellllonsoda]

I looked it up on the internet and found it.
But I don't know how to do that specifically on Kubuntu. Thank you.

[jlittle]

build-essential and dkms:

sudo apt install build-essential dkms

You might need some other packages. The README or INSTALL would normally tell you what's needed.

Building your own drivers for a device can be a pain, as it breaks often, as they need to be recompiled every time you get a new kernel. dkms is meant to handle that, and it's great when it works smoothly. I have had periods when it did, but others when it didn't.

[mellllonsoda]

しかし、インターネットがないのでパッケージが見つからないと表示されてしまいました。

Translation:
However, since there is no internet, it says that the package cannot be found.

[jlittle]

However, since there is no internet, it says that the package cannot be found.

Of course, I should have I should have been mindful of that. I saw a "how to" question and answered that narrowly.

acheron's reply says how to get the packages without internet. He or she has suggested that you open the iso, select the pool directory, b, build-essential, and copy out the .deb file to a convenient directory, then to poo/d/dkms and copy the .deb there too. Then, open that directory in dolphin and click the .deb files; the QApt Package Installer should open and offer to install the package.

Every encouragement, but it sounds daunting as I write it.

I am surprised that a 2014 device lacks a driver in the Linux kernel.

[mellllonsoda]

Unfortunately QApt says the dependency cannot be satisfied.

[acheron]

Try inserting and mounting your install usb. That should act as an apt repository allowing the packages to be installed using apt install on the command line.

If not:

1) Don't use qapt
2) copy the debs to an empty folder
3) In konsole go to that folder and do sudo apt install ./filenameofdeb1 ./filenameofdeb etc
4) If that fails on a dependency, copy that deb from the pool directory and retry the apt install adding that debs filename as above.
5) repeat as required until dependencies are satisfied and they install.

[mellllonsoda]

I accidentally reset my PC and it took a long time to recover.

Then something occurred to me. When I tried using a USB Ethernet adapter for Nintendo Switch, I was able to connect to the Internet without any problems. Apparently this was the solution.

If anyone has encountered the same problem, this method may be helpful. try it.

Well then, thank you very much.

[Snowhog]

Are you saying you plugged in a USB Ethernet adapter to your PC, and now you have Internet connectivity?

[mellllonsoda]

yes.
The adapter I used is TP-link's UE306.