[ubuntu] After upgrade to 2016.04, caot access USB fat32 storage devices (permission)

Recently I upgraded to the new 16.04 Ubuntu on my dual boot iMac.

Now, when a USB device (fat32) is plugged in, a message is displayed indicating that the permissions are undiscoverable. I caot access the device or files.

I found a potential one-off solution for one devic, using a label. In /etcfstab I entered the following:

LABEL=STICK /media/lexar vfat rw,uid=1004,gid=users 0

I seek a more general solution, since I suspect that this is a bug; Ubuntu has always made light work of mounting USB drives of any nature.

Can someone indicate whether this is a problem due to incomplete updating or a bug?

THank you

Alan Davis