$ sudo apt-get install openjdk-7-jre
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package openjdk-7-jre is a virtual package provided by:
  oracle-java9-installer 9b112+9b112arm-1~webupd8~1
  oracle-java8-installer 8u77+8u77arm-1~webupd8~4
  oracle-java7-installer 7u80+7u60arm-0~webupd8~1
You should explicitly select one to install.