Package php5 have no installation candidate (Ubuntu 16.04)

When i try to install php5 in Ubuntu 16.04 by using following code: sudo apt-get install php5 php5-mcrypt I get following error: Reading package lists... Done Building dependency tree Reading state information... Done Package php5 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 'php5' has no installation candidate I have tried reinstalling but it does not help. All this error was encountered after I updated my 15.10 Ubuntu to 16.04