I always forget this, therefore, I'm writing this really short article as a note.
It's a solution that works for me described on ask.fedoraproject.org
Change to super mode
sudo su
List volumes on your PC
[root@mynotebook ptacnikt]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 999320 195976 734532 22% /boot /dev/sdb1 1305600 1305600 0 100% /run/media/ptacnikt/Xubuntu 17.04 amd64
The USB stick might be /dev/sdb1 like in my case
Unmount it
umount /dev/sdb1
Format it
mkfs.vfat /dev/sdb1
Plug it out, plug it in again and it should work. Done.
