Bug#922815: insserv FATAL while updating as mountkernfs has to be enabled to use service udev

[Dmitry Bogatov]

[2019-02-22 15:30] shirish शिरीष <shirishag75 at gmail.com>
> > >
> > > Setting up udev (240-6) ...
> > > update-initramfs: deferring update (trigger activated)
> > > insserv: FATAL: service mountkernfs has to be enabled to use service udev
> > >
> > > maybe it just needs mountkernfs to be added in the interactive bit at
> > > the bottom or somewhere else ?
> > [Dmitry Bogatov]
> > Maybe. But I updated recently, and I did not encountered this problem.
> > Please test my wild guess:
> >
> > 	$ find /etc/rcS.d|grep mountkernfs
> >
> Dear Dmitry,
>
> The output is empty or zero -
>
> shirish at debian:~$ find /etc/rcS.d|grep mountkernfs
> shirish at debian:~$

Interesting, you seems somehow got mountkernfs.sh script removed from
runlevel S.

Can you please invoke as root

	# update-rc.d mountkernfs.sh enable S

and then retry your upgrade.
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