"Updates for Java SE 7 released after April 2015, and updates for Java SE 6 released after April 2013 are only available to Oracle Customers through My Oracle Support (requires support login).
Java SE Advanced offers users commercial features, access to critical bug fixes, security fixes, and general maintenance".
It's highly recommended you update to Oracle Java 8. Check out the following articles for how to install Oracle Java 8 in Ubuntu (or Linux Mint and derivatives) or Debian via PPA.
From Web Upd8 blog: