root@Minecraft ~ # apt-get install -y openjdk-7-jre
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package openjdk-7-jre 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' has no installation candidate