The Tutorial shows you How to Install and Getting-Started with the Latest Eclipse 2023-03 R IDE Java JEE for Linux Ultimate Edition 3.5 KDE4 Desktop 32bit.
There is the Possibility also to Install the Eclipse Platform via apt-get But the Ultimate 3.5 Depends from Ubuntu Precise apt Repositories 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 Ultimate Edition 3.5 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 ;)
Download Eclipse IDE Luna 4.3:Eclipse 2023-03 R IDE Linux 32bit