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This question already has an answer here:

I tried installing opendjk-7 in the way that was suggested here, but I get this error:

W: The repository 'http://ppa.launchpad.net/openjdk-r/ppa/ubuntu yakkety Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://ppa.launchpad.net/openjdk-r/ppa/ubuntu/dists/yakkety/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

marked as duplicate by Zanna, Eric Carvalho, Kevin Bowen, TheWanderer, Kaz Wolfe Jan 29 '17 at 19:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • It means there is no package for Ubuntu 16.10. You can ask the maintainer to make one for 16.10 or find other PPAs that do so. – edwinksl Nov 3 '16 at 21:43
  • I'm pretty sure OpenJDK is available from the default repos. – TheWanderer Nov 3 '16 at 21:57
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There is no pagckage for Ubuntu 16.10 (Yakkety). Check openjdk-r/ppa/ubuntu/dists/ . Try to install openjdk9 instead

sudo apt-get update
sudo apt-get install openjdk-9-jdk

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