[UE5.4.2/Ubuntu 24.04] New C++ classes won't show up in Content Browser

Hello everyone,

after having recently taken the plunge from Windows 10 to Linux, I am now trying to get UE to run, so I can continue getting to know the engine. Please be aware that I am very much a beginner when it comes to both UE and Linux.

I am using the precompiled version of the engine on Ubuntu 24.04

The first thing I’ve noticed is that my “Add”-Button in the Content Browser does not work, with the tooltip giving this message:
image

Adding things via right-click in the content browser seems to work tho. Well, for the most part.
When I try to add a new C++ class, the source files are generated and do show up in the file system/Rider solution view:


image

However, they do not show up in the content browser, where I would expect them, having done the right-click->add in this very place:

The tooltip on the “Add”-button makes me suspect that it’s something to do with wrong/missing permissions, but I’m too much of a Linux beginner to know what to look for.
Any help with this would be greatly appreciated.