I TRIED to confirm the issue in a clean VirtualBox VM, but failed. On Debian Buster after enabling Backports, installing wireguard and confirming that it was built by dkms, I got the same issue. Rebooting the system did not help.
I collected more information about the dkms module, and found the issue: "wireguard-dkms" was built for the newest kernel available in buster (not backports), in my case "4.19.0-11-amd64" (see output of "dkms status") due to first installing "linux-headers-amd64" (wasn't required before). Testing with "modprobe wireguard" showed, that the kernel module could not be loaded. And that was because I was running the older kernel version "4.19.0-10-amd64". Upgrading and restarting the system solved the issue in my case. It must be that a new kernel version was released while I was working today with the VM, maybe a similar issue happened to you, too? Best Regards, Felix Stupp
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