After reading all these comments, me too, etc. etc. This is what fixed it for me, although I set mine at 200MB instead of 15MB.
https://unix.stackexchange.com/questions/180818/gnome-nautilus-copy- files-to-usb-stops-at-100-or-near -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/1208993 Title: Ubuntu slows down and hangs while copying file from/to USB To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1208993/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs