Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_XXXXXXX/lib/modules/5.4.0-1-amd64/modules.builtin.bin'

[Ilkka Prusi]

On Wed, 08 Jan 2020 23:07:22 +0000 Ben Hutchings <b...@decadent.org.uk> 
wrote:
On Wed, 2020-01-08 at 16:48 -0500, debian wrote:
Printing spurious error messages is a bug, and we will fix it (whether
in kmod or in initramfs-tools, is to be decided).

So the change causing it should be reverted until it has been decided 
and fixed.

--
 - Ilkka