I'm not facing an actual issue yet, rather trying to avoid any...
Currently, these packages are installed on my PC (automatically installed during a fresh install of Kubuntu 14.04):
$ apt list openjdk* --installed
Listing... Done
**openjdk-6-jdk**/trusty-updates,trusty-security,now 6b36-1.13.8-0ubuntu1~14.04 amd64 [installed,automatic]
**openjdk-6-jre**/trusty-updates,trusty-security,now 6b36-1.13.8-0ubuntu1~14.04 amd64 [installed,automatic]
**openjdk-6-jre-headless**/trusty-updates,trusty-security,now 6b36-1.13.8-0ubuntu1~14.04 amd64 [installed,automatic]
**openjdk-6-jre-lib**/trusty-updates,trusty-security,now 6b36-1.13.8-0ubuntu1~14.04 all [installed,automatic]
**openjdk-7-doc**/trusty-updates,trusty-security,now 7u79-2.5.6-0ubuntu1.14.04.1 all [installed,automatic]
**openjdk-7-jre**/trusty-updates,trusty-security,now 7u79-2.5.6-0ubuntu1.14.04.1 amd64 [installed]
**openjdk-7-jre-headless**/trusty-updates,trusty-security,now 7u79-2.5.6-0ubuntu1.14.04.1 amd64 [installed]
May I safely leave these packages present on my PC and install Oracle JDK 8 from Oracle.com along with these older versions of Java?
And is there any recommendation regarding the installation directory for Oracle JDK 8?
Thank you in advance for your suggestions.