getting "E: Sub-process /usr/bin/dpkg returned an error code (1)"

I am trying to install java in my debian server but when I am running any of these command getting an error massage every time that is - Code: update-rc.d: error: insserv rejected the script header    dpkg: error processing avahi-daemon (--configure):  subprocess installed post-installation script returned error exit status 1 dpkg: dependency problems prevent configuration of libnss-mdns:  libnss-mdns depends on avahi-daemon (>= 0.6.16-1); however:   Package avahi-daemon is not configured yet. dpkg: error processing libnss-mdns (--configure):  dependency problems - leaving unconfigured configured to not write apport reports                                       configured to not write apport reports                                                                           Errors were encountered while processing:  exim4-base  exim4-daemon-light  exim4  avahi-daemon  libnss-mdns E: Sub-process /usr/bin/dpkg returned an error code (1) I am using these command- Code: apt-get upgrade --show-upgraded apt-get install openjdk-6-jdk apt-get install sun-java6-jdk Is any one know how can I solve this problem? Thx

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