I also experience this problem on Linux Mint 17.3 KDE (based on Ubuntu 14.04), copying through the KDE I/O subsystem (Dolphin or Krusader). So, I think Nautilus (which shows in the "Affects" field) is just a victim.
I have a notebook (HP ProBook 450 G1) with 4 GB RAM. I was thinking it might have been a problem with my laptop chipset (some sort of a bus saturation problem), but I see many have the same problem and that there's a workaround (I'll try as soon as possible).
I also experience this problem on Linux Mint 17.3 KDE (based on Ubuntu 14.04), copying through the KDE I/O subsystem (Dolphin or Krusader). So, I think Nautilus (which shows in the "Affects" field) is just a victim.
I have a notebook (HP ProBook 450 G1) with 4 GB RAM. I was thinking it might have been a problem with my laptop chipset (some sort of a bus saturation problem), but I see many have the same problem and that there's a workaround (I'll try as soon as possible).
Any official statement from Ubuntu developers?