Java is not installed: what to do? How to install on Ubuntu?

People who have just installed a brand new operating system on their computer or laptop often encounter a message on the Internet like “Java needs to be installed for proper operation”. Inexperienced users this message can terrify and cause confusion. But do not panic, you have come to the right place. This article will examine in detail the question of why the presented software is necessary, and what to do if Java is not installed. Detailed installation instructions for both Windows users and Linux “users” of Ubuntu will also be posted.

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