Problems with UNetbootin can be solved by using USB ISO image writer like Etcher where Linux Mint 19 Tara was installed well. GParted must be used with caution.
In this article, the author shares his experience in creating such a bootable USB flash drive, comes complete with a working Puppy Linux distribution that is persistence. Unlike “live” bootable USB flash drive of other distribution, where once a session is over, all the updates, software installed are lost, Puppy Linux will keep all the these to make it persistence & adapt to the user’s needs.
This article contains the sharing of experience & learning on how to revive old PCs/laptops using the light weight Puppy Linux as OS to replace Windows. It gives step-by-step details on how to fit the entire OS plus applications & software into a USB flash dive of a minimum of 4 Gb, with larger capacities being more effective.