Unable to verify plugins, then freezes #9471

Apache NetBeans version

Apache NetBeans 30

What happened

Okay, so first off, I'm trying to install some old plugins to add Java ME (Micro Edition) support (I'm trying to program stuff for blu-rays...it's a long story). I have all the required plugins for this added to the Downloaded page, yet when I go to install them, I get this error:
Cannot complete the validation of downloaded plugins

The validation of downloaded plugins cannot be completed, cause: NBM /home/<homefolder>/.netbeans/30/update/download/org-netbeans-modules-javame-devicemanager.nbm needs unpack200 to process following entries: netbeans/modules/org-netbeans-modules-javame-devicemanager.jar.pack.gz

I don't know what this "unpack200" is, nor where to get one. Is this a bug or am I just stupid?

Language / Project Type / NetBeans Component

Plugin Manager

How to reproduce

Download the plugins I'm trying to install:

• GitHub.com/lqthanh/j2me-archive
• GitHub.com/BackendJava/Plugins-para-Reportes-en-java (just for the one plugin contained therein)
• Oracle.com/java/technologies/sdk-downloads.html

Attempt to install them.

Did this work correctly in an earlier version?

No / Don't know

Operating System

Linux Mint 22.3

JDK

JavaMEv8.3.1 (or trying to, at least, I haven't gotten to that part yet)

Apache NetBeans packaging

Other

Anything else

No response

Are you willing to submit a pull request?

No