Setting up icedtea-netx:amd64 (1.6.2-1) ...
update-alternatives: error: alternative /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/javaws for javaws not registered; not setting
dpkg: error processing package icedtea-netx:amd64 (--configure):
 subprocess installed post-installation script returned error exit status 2
dpkg: dependency problems prevent configuration of icedtea-8-plugin:amd64:
 icedtea-8-plugin:amd64 depends on icedtea-netx (= 1.6.2-1); however:
  Package icedtea-netx:amd64 is not configured yet.

dpkg: error processing package icedtea-8-plugin:amd64 (--configure):
 dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of default-java-plugin:
 default-java-plugin depends on icedtea-8-plugin; however:
  Package icedtea-8-plugin:amd64 is not configured yet.

dpkg: error processing package default-java-plugin (--configure):
 dependency problems - leaving unconfigured

alex@MSAK1:/root/icedtea-netx/DEBIAN$ diff ~/icedtea-netx_postinst_alexk postinst
116c116
{               if [ $priority7 -gt $priority8 ] && [ ! -f $base7dir/jre/bin/$i ]; then
---
}               if [ $priority7 -gt $priority8 ] && [ ! -f $base8dir/jre/bin/$i ]; then
121c121
{               if [ $priority8 -gt $priority7 ] && [ ! -f $base8dir/jre/bin/$i ]; then
---
}               if [ $priority8 -gt $priority7 ] && [ ! -f $base7dir/jre/bin/$i ]; then

priority7=1060
base7dir=/usr/lib/jvm/java-7-openjdk-amd64
man7dir=$base7dir/jre/man
priority8=1081
base8dir=/usr/lib/jvm/java-8-openjdk-amd64
man8dir=$base8dir/jre/man

...

                # 7's priority is higher, but 7 is not installed, set it to 8
                if [ $priority7 -gt $priority8 ] && [ ! -f $base8dir/jre/bin/$i ]; then
                    update-alternatives --set $i $base8dir/jre/bin/$i
                fi

                # 8's priority is higher, but 8 is not installed, set it to 7
                if [ $priority8 -gt $priority7 ] && [ ! -f $base7dir/jre/bin/$i ]; then
                    update-alternatives --set $i $base7dir/jre/bin/$i
                fi

$ dpkg -l '*icedtea*' | grep ii
ii  icedtea-8-plugin:amd64 1.6.2-1      amd64        web browser plugin based on OpenJDK and IcedTea to execute Java applets
ii  icedtea-netx:amd64     1.6.2-1      amd64        NetX - implementation of the Java Network Launching Protocol (JNLP)
ii  icedtea-netx-common    1.6.2-1      all          NetX - implementation of the Java Network Launching Protocol (JNLP)

dpkg -l '*icedtea*' | grep ii
ii  icedtea-8-plugin:amd64 1.6.2-2      amd64        web browser plugin based on OpenJDK and IcedTea to execute Java applets
ii  icedtea-netx:amd64     1.6.2-2      amd64        NetX - implementation of the Java Network Launching Protocol (JNLP)
ii  icedtea-netx-common    1.6.2-2      all          NetX - implementation of the Java Network Launching Protocol (JNLP)

diff icedtea-netx_1.6.2-1/DEBIAN/postinst icedtea-netx_1.6.2-2/DEBIAN/postinst
68c68
{       if [ -f $base7dir/jre/bin/javaws ]; then
---
}       if false && [ -f $base7dir/jre/bin/javaws ]; then
114a115,116
}               update-alternatives --set $i $base8dir/jre/bin/$i
}
116,118c118,120
{               if [ $priority7 -gt $priority8 ] && [ ! -f $base8dir/jre/bin/$i ]; then
{                   update-alternatives --set $i $base8dir/jre/bin/$i
{               fi
---
}               #if [ $priority7 -gt $priority8 ] && [ ! -f $base8dir/jre/bin/$i ]; then
}               #    update-alternatives --set $i $base8dir/jre/bin/$i
}               #fi
121,123c123,125
{               if [ $priority8 -gt $priority7 ] && [ ! -f $base7dir/jre/bin/$i ]; then
{                   update-alternatives --set $i $base7dir/jre/bin/$i
{               fi
---
}               #if [ $priority8 -gt $priority7 ] && [ ! -f $base7dir/jre/bin/$i ]; then
}               #    update-alternatives --set $i $base7dir/jre/bin/$i
}               #fi