There is no file linux/init.h

I'm trying to write my own pci-device driver on an Ubuntu system. The example I found says that I need: #include #include #include I'm using Qt and it underlines the first include as a mistake. When I put the mouse cursor under the 2nd or 3rd line, it shows me a tip: /usr/include/linux/module.h or /usr/include/linux/pci.h, so I opened /usr/include/linux in file explorer, and there is no init.h. I ran sudo apt install linux-headers-generic but it didn't help. locate linux/init.h gives: /usr/src/linux-headers-5.15.0-121/include/linux/init.h /usr/src/linux-headers-5.15.0-122/include/linux/init.h /usr/src/linux-headers-5.15.0-43/include/linux/init.h So is my problem that I have to add something to my PATH or do I have to install something else? Yes, I've seen a lot of topics about people having problems with compiling something because of linux/init.h: no such file or directory, but I am not compiling, I can't even include it.