root@Catbus-Kali:/home/ghibli/rtl8812au# apt-get install realtek-rtl88xxau-dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
realtek-rtl88xxau-dkms
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,821 kB of archives.
After this operation, 17.1 MB of additional disk space will be used.
Get:1
http://mirrors.ocf.berkeley.edu/kali kali-last-snapshot/contrib amd64 realtek-rtl88xxau-dkms all 5.3.4~20191031-0kali1 [1,821 kB]
Fetched 1,821 kB in 13s (137 kB/s)
Selecting previously unselected package realtek-rtl88xxau-dkms.
(Reading database ... 512267 files and directories currently installed.)
Preparing to unpack .../realtek-rtl88xxau-dkms_5.3.4~20191031-0kali1_all.deb ...
Unpacking realtek-rtl88xxau-dkms (5.3.4~20191031-0kali1) ...
Setting up realtek-rtl88xxau-dkms (5.3.4~20191031-0kali1) ...
Loading new realtek-rtl88xxau-5.3.4~20191031 DKMS files...
Building for 5.4.0-kali4-amd64
Module build for kernel 5.4.0-kali4-amd64 was skipped since the
kernel headers for this kernel does not seem to be installed.