Device "UUID" Not found you are being dropped into an emergency shell

It needs to be done in manjaro-chroot, while booted in the live USB.

This is a known issue with Manjaro / Arch, while some other distros already implement their own fixes by including the proper modules by default, universally for all installations.

Hopefully, this is done as a patch for future Manjaro installers:

Here is another thread in which I go through the step-by-step with some more detail: