Thanks @Paul for the update instructions. I worked it out myself using a slightly different method that just replaced the jar files after stopping the servant service
systemctl stop supernode.service
wget http://bob.nem.ninja/nis-ncc-0.6.79.tgz
tar -xvzf nis-ncc-0.6.79.tgz
cp ./package/nis/nem-deploy-0.6.79-BETA.jar /home/nis/nis-ncc/package/nis/nem-deploy-0.6.79-BETA.jar
cp ./package/nis/nem-deploy-0.6.79-BETA.jar /home/nis/nis-ncc/package/nis/nem-infrastructure-server-0.6.79-BETA.jar
cp ./package/nis/nem-deploy-0.6.79-BETA.jar /home/nis/nis-ncc/package/nis/nem-core-0.6.79-BETA.jar
cp ./package/nis/nem-deploy-0.6.79-BETA.jar /home/nis/nis-ncc/package/nis/nem-peer-0.6.79-BETA.jar
rm /home/nis/nis-ncc/package/nis/nem-deploy-0.6.77-BETA.jar
rm /home/nis/nis-ncc/package/nis/nem-infrastructure-server-0.6.77-BETA.jar
rm /home/nis/nis-ncc/package/nis/nem-core-0.6.77-BETA.jar
rm /home/nis/nis-ncc/package/nis/nem-peer-0.6.77-BETA.jar
systemctl start supernode.service
I also took the opportunity to update all packages:
apt-get update
apt-get upgrade
Hope this might help others
KC