veth.ko missing

On a Raspberry Pi 4, running Ubuntu Focal 64bit. LXD keeps getting broken, and it seems like it’s because the kernel module veth.ko is missing.

In an attempt to restore it I did:

sudo apt install linux-modules-5.4.0-1012-raspi --reinstall

This restores veth.ko and makes LXD work. However, if I reboot, veth.ko is deleted. Is there some configuration I need to change somewhere that’s currently removing veth.ko for ‘reasons’?