Running "update-rc.d rsyslog disable 2" resulted in error messages
like the following:

ERROR MESSAGE:
insserv: warning: current start runlevel(s) A of script 'rsyslog'
overrides LSB defaults B

There were four lines with similar text but with A and B as follows:
a) A = (3 4 5); B = (2 3 4 5)
b) A = (0 1 2 6); B= (0 1 6)
c) A = (3 4 5); B = (2 3 4 5)
d) A = (0 1 2 6); B = (0 1 6)

Is this Ok?

Inspecting /etc/rcN.d, I found the rsyslog links are now prepended with a K.

Thanks for your helpful replies.