Processing triggers for linux-image-4.15.0-23-generic (4.15.0-23.25) ...
/etc/kernel/postinst.d/dkms:
Error! Your kernel headers for kernel 4.15.0-23-generic cannot be found.
Please install the linux-headers-4.15.0-23-generic package,
or use the --kernelsourcedir option to tell DKMS where it's located
Processing triggers for linux-image- 4.15.0- 23-generic (4.15.0-23.25) ... postinst. d/dkms: 4.15.0- 23-generic package,
/etc/kernel/
Error! Your kernel headers for kernel 4.15.0-23-generic cannot be found.
Please install the linux-headers-
or use the --kernelsourcedir option to tell DKMS where it's located
root@postel:~# dpkg-query -s linux-headers- 4.15.0- 23 4.15.0- 23
Package: linux-headers-
Status: install ok installed
Priority: optional
Section: devel
Installed-Size: 75198