root@raspberrypi:/home/pi# apt install wireguard-dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  dkms
Suggested packages:
  python3-apport menu
Recommended packages:
  wireguard wireguard-tools
The following NEW packages will be installed:
  dkms wireguard-dkms
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 328 kB of archives.
After this operation, 2045 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 http://ftp.igh.cnrs.fr/pub/os/linux/raspbian/raspbian buster/main armhf dkms all 2.6.1-4 [74.4 kB]
Get:2 http://deb.debian.org/debian unstable/main armhf wireguard-dkms all 1.0.20200611-1 [253 kB]
Fetched 328 kB in 1s (530 kB/s)
Selecting previously unselected package dkms.
(Reading database ... 114102 files and directories currently installed.)
Preparing to unpack .../archives/dkms_2.6.1-4_all.deb ...
Unpacking dkms (2.6.1-4) ...
Selecting previously unselected package wireguard-dkms.
Preparing to unpack .../wireguard-dkms_1.0.20200611-1_all.deb ...
Unpacking wireguard-dkms (1.0.20200611-1) ...
Setting up dkms (2.6.1-4) ...
Setting up wireguard-dkms (1.0.20200611-1) ...
Loading new wireguard-1.0.20200611 DKMS files...
It is likely that 4.19.118-v7l+ belongs to a chroot's host
Building for 4.19.118+, 4.19.118-v7+, 4.19.118-v7l+ and 4.19.118-v8+
Building initial module for 4.19.118+
Done.

wireguard.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.19.118+/kernel/net/

depmod...

DKMS: install completed.
Building initial module for 4.19.118-v7+
Done.

wireguard.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.19.118-v7+/kernel/net/

depmod...

DKMS: install completed.
Building initial module for 4.19.118-v7l+
Done.

wireguard.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.19.118-v7l+/kernel/net/

depmod...

DKMS: install completed.
Module build for kernel 4.19.118-v8+ was skipped since the
kernel headers for this kernel does not seem to be installed.
Processing triggers for man-db (2.8.5-2) ...