Re: Copying files to a SD Card - Permission denied
Because you are (copying) or installing, . . . anyway, you are using files that require a "superuser" permission. So using your keyboard, press and hold the "Alt" key and then tap the "F2" key. When the little window pops up, type:
and press enter or mouse-click "Launch".
A moment later, the file manager (Nautilus) will open and then you can move files into "Boot" or is that spelled "boot". I cannot remember.
BUT more importantly, are you trying to make (build or install) a USB bootable linux? And if I may ask, what are you working on? As you said, you may be in over your head and before any damage gets done, let the Community have a look at it, please.
AMD Athlon II X4 620, 4gig ddr2-800, m/b MSI K9N6PGM2, 1T SATA, EVGA 9500GT, Brother MFC-240C prntr, LG DVD-rom GSA-H55N