Can't drag & dropping files from HDD to USB key: Nautilus claims the key is read-only

[Bruno Girin]

When dragging and dropping files from my local disk to a connected USB key, Nautilus claims that the key is read-only. Copying the same files via the command line works.

Steps to reproduce:
- Plug in a USB key that has space on it and that is not write protected
- Drag and drop a file from an another device to the key in Nautilus

Expected result: the file is copied

Actual result: Nautilus shows an error window that claims the key is read only (see screen shot)

Workaround: copy the files via the command line

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nautilus 1:3.18.4.is.3.14.3-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Aug 25 13:46:04 2016
GsettingsChanges: b'org.gnome.nautilus.window-state' b'geometry' b"'890x550+5+162'"
InstallationDate: Installed on 2016-05-02 (114 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)