The Tututorial Show How to Install and Getting-Started with the Latest Eclipse 2023-03 R IDE Java JEE x8664 for Linux Kubuntu 12.04 Precise Pangolin KDE4 Amd64 Desktop.
There is the Possibility also to Install the Eclipse Platform via apt-get But the Ubuntu 12 Precise apt Repositories from Wich Kubuntu 12 Depends are still Back to Eclipse 3.7 Indigo.
So at the Moment if you want Install the Latest Eclipse 2023-03 R Build on Linux Kubuntu 12 you will Need to Download and Install Eclipse 2023-03 R JEE Release for Linux.
The contents give Focus only to the Essential Instructions and Commands so to make the Tut easier to understand ;)

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Download Latest Eclipse IDE JEE for Linux:
Eclipse 2023-03 R IDE JEE 64-bit Linux -
Double-Click on Archive and Extract Eclipse into /tmp
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Open Terminal Window
(Press “Enter” to Execute Commands) -
Relocating Eclipse.
sudo chown -R root:root /tmp/eclipse && mv /tmp/eclipse /opt/
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Starting Eclipse from Terminal.
Making a Symlink
ln -s /opt/eclipse/eclipse /usr/local/bin/eclipse
After you can Start Eclipse JEE from Terminal simply with:
eclipse
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Create an Eclipse Desktop Launcher for Easy-Starting:
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Recommended Oracle JDK Installation
Required to Get the Best Results from Eclipse.