Installation keeps failing - error saying "failed to mount: ‘/dev/loop0’"

[soundofthunder]

@Phoen

Balena Etcher

is generally not recommended.

One of the few most viable bootable USB solutions is Ventoy:

[HowTo] Create a Ventoy USB to launch Manjaro (and other) ISO's

Ventoy A New Bootable USB Solution Boot with a Ventoy USB and ISO files are automatically listed in the Ventoy menu. Any ISO present can then be launched and booted directly. The obvious advantage here is that instead of constantly writing a Manjaro Installer ISO to a new USB any time you might need it, every ISO you desire can be stored on the Ventoy USB and launched the same way. A 32GB capacity USB would allow ample space to store several ISOs of your choice; an 8GB capacity USB might …

Also, consider changing the type, brand and/or size of USB that you use.

Regards.