Does anyone know a good Linux live image for diagnosing systems?

https://lemmy.blahaj.zone/post/2914311

Does anyone know a good Linux live image for diagnosing systems? - Blåhaj Lemmy

Adding on to other suggestions, if you’re not aware of Ventoy it’s a very handy tool. Using it you can have a USB drive with several live images on it which you can choose at boot time. Great for quick testing, just drop an ISO in a folder!
Ventoy

Ventoy is an open source tool to create bootable USB drive for ISO files. With ventoy, you don't need to format the disk again and again, you just need to copy the iso file to the USB drive and boot it.

Unfortunately I believe the usb has to be created from Windows…
What makes you think that? Their website has instructions for installation via a Linux box. https://www.ventoy.net/en/doc_start.html
Ventoy

Ventoy is an open source tool to create bootable USB drive for ISO files. With ventoy, you don't need to format the disk again and again, you just need to copy the iso file to the USB drive and boot it.