Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_N1a1Mk/lib/modules/5.4.0-1-amd64/modules.builtin.bin'

[Benjamin Poirier <benjamin.poirier@gmail.com>]

I'm not sure if it's related but I saw almost the same error on last
upgrade (but for 5.4.0-2):

depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_J2sneW/lib/modules/5.4.0-2-amd64/modules.builtin.bin'

and I now get:

root@vsid:~# lttng list --kernel
Error: Unable to list kernel events: Kernel tracer not available
root@vsid:~# journalctl -u lttng-sessiond.service
[...]
Jan 07 09:33:20 vsid lttng-sessiond[403]: Error: Failed to load kmod library resources
Jan 07 09:33:20 vsid lttng-sessiond[403]: Warning: No kernel tracer available

lttng-modules-dkms is installed. I can load the modules manually but I
still get the same error.