build error - 'openjdk-7-jre-headless' has no installation candidate

[avrahams]

trying to build from fresh I get:

Building dependency tree...
Reading state information...
Package openjdk-7-jre-headless is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'openjdk-7-jre-headless' has no installation candidate
The command '/bin/sh -c export DEBIAN_FRONTEND=noninteractive && rm -rf /var/libapt/lists/* && apt-get update && apt-get -y install perl tar wget curl openjdk-7-jre-headless && apt-get autoremove -y && apt-get autoclean -y && rm -rf /var/lib/apt/lists/* /tmp/*' returned a non-zero code: 100