I have tried to deploy a business network using composer to but it fails with the following error
Error: event message must be properly signed by an ident
There are several reasons why you might get this error
composer -v
composer network deploy -a test.bna -i PeerAdmin -s anything -p hlfv1
You are running an older version of docker. Level may be checked by invoking the command: docker -v
Invoking the ./prereqs-ubuntu.sh
detailed in the 'Installing a developing with Hyperledger Composer' will update the prerequisites accordingly.