How to install java9 on elementaryOS Freya or Ubuntu 14.04 LTS
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Add ppa. (I think it's a relatively famous ppa, but if you can't trust it, try a different method.)
$ sudo add-apt-repository ppa:webupd8team/java -
Update.
$ sudo apt update -
Let's see if java9 can be installed.
$ apt search java9
You found it properly.
Let's install oracle-java9-installer. -
Now install!
$ sudo apt install oracle-java9-installer
Let's wait patiently.
If java8 is included, you will be asked if you want to remove it during the installation. -
Congratulations
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