make: *** [Makefile:2449: modules] Error 2 while trying to install a wifi adapter driver

/home/ubuntu/Desktop/driver/RTL88x2BU_WiFi_linux_v5.13.1-20 <br/>gbd7c7eb9d_COEX20210316-18317b7b.20210702/driver/rtl88x2BU_WiFi_linux_v5.13.1-20-<br/>gbd7c7eb9d.20210702_COEX20210316-18317b7b/core/rtw_br_ext.c:20:11: fatal error: net/ipx.h: No such file or directory<br/>
   20 |  #include <net/ipx.h><br/>
      |           ^~~~~~~~~~~<br/>
compilation terminated.<br/>
make[2]: *** [scripts/Makefile.build:297: /home/ubuntu/Desktop/driver<br/>/RTL88x2BU_WiFi_linux_v5.13.1-20-gbd7c7eb9d_COEX20210316-18317b7b.20210702/driver<br/>/rtl88x2BU_WiFi_linux_v5.13.1-20-gbd7c7eb9d.20210702_COEX20210316-18317b7b/core/rtw_br_ext.o] Error 1<br/>
make[1]: *** [Makefile:1906: /home/ubuntu/Desktop/driver/RTL88x2BU_WiFi_linux_v5.13.1-20-<br/>gbd7c7eb9d_COEX20210316-18317b7b.20210702/driver/rtl88x2BU_WiFi_linux_v5.13.1-20-<br/>gbd7c7eb9d.20210702_COEX20210316-18317b7b] Error 2<br/>
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-67-generic'<br/>
make: *** [Makefile:2449: modules] Error 2<br/>
##################################################<br/>
Compile make driver error: 2<br/>
Please check error Mesg<br/>
##################################################<br/>
<br/>

edit: the solution found by Denatunium was to downgrade the kernel https://discourse.ubuntu.com/t/how-to-downgrade-the-kernel-on-ubuntu-20-04-to-the-5-4-lts-version/26459

the below solution exist if it is still not working

It look like a missing ipx.h header file

Do the following to try to fix your problem:

first install the missing header file

sudo apt-get install linux-headers-$(uname -r)

then clean the driver source code

cd /home/ubuntu/Desktop/driver/RTL88x2BU_WiFi_linux_v5.13.1-20-gbd7c7eb9d_COEX20210316-18317b7b.20210702
make clean

then rebuild the driver

make

then install

sudo make install