I recently build kernel from vanilla-sources in "next" release on a virtual machine (qemu KVM).

When I do boot-update, an error message was showed:

ERROR: Ego encountered an unexpected error: AttributeError
ERROR: Full traceback written to /tmp/ego-traceback-18954.txt

The file is added. Aparently, the problem is with cpu-microcode.

When I install debian-sources, ego boot update does not fail.

Whith grub-mkconfig I could add the new kernel to grub.