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.
