Geeqie - View Raw Images (NEF)

I've been using my Nikon d7200 camera to shoot pictures in the Raw Mode instead of jpg.  The Raw Mode pictures have a file extension of .NEF and the build-in Ubuntu thumbnail viewer doesn't support .NEF files.  I wanted something that would give me a thumbnail view of all my .NEF files in any given directory and give me some options for moving those files around.  I found a nice programs that meets these needs and more, Geeqie. 

On Ubuntu 16.04 it's in the Software Center so just install it from there.  Once installed you'll have to associate the .NEF files with Geeqie then you can just double click on a .NEF file to open it in Geeqie.

The Destination is Read-Only (SD Card Stuck)

On my Ubuntu 16.04 box, one of my camera's SD CARDS was stuck in READ ONLY mode.  I could copy files from the card but not to it and I couldn't delete any files that were already on it.  The card worked fine in the camera and worked as expected on a MS Windows machine but not on my Ubuntu Box.  In Nautilus I kept getting the ERROR "The Destination is Read-Only" every time I tried to delete old pictures from the card.

I reformatted the SD Card, I changed the partition type in Gparted, I changed its UUID, and I reset the computer but nothing worked (and YES I checked the little "write protect" switch on the SD Card).  My Ubuntu box just refused to allow any writes or deletes from the SD Card. 

I searched (googled) for 2 hours before I came across this little gem in a comment on a discussion on a non-working thumb drive.  Here's what worked for me.

Open a TERMINAL window and type:

        sudo killall nautilus 

That's it.

I don't think you need the "sudo" but what the hell I used it.