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Launch Gnome Boxes in your favorite Linux distribution, click the PLUS sign on the top left corner.

On the above pop up box select ( Download an operating system ).

Screenshot from 2022-09-07 18-09-03

Type manjaro in the search box, click next and you pretty much done, we advise a minimum of 4gb ram for a better virtual machine experience.

Screenshot from 2022-09-07 18-11-14

Alternatively you can also have a look a virtualization with Virt-manager or Virtualbox or Vmware.