Answer by A.B. for How to define createdate of entire image folder using terminal with exiftool?

Files with the warning

Warning: No writable tags set from /home/ubuntu/house/120151116163735582.jpg

don't have a tag CreateDate. For this reason, the files can not be renamed.

To illustrate this:

% exiftool '-filename<CreateDate' -d %y%m%d_%H%M%S%%-c.%%le  ~/tmpWarning: No writable tags set from /home/aboettger/tmp/relax.jpg    1 directories scanned    0 image files updated    1 image files unchanged% exiftool -CreateDate ~/tmp   ======== /home/aboettger/tmp/relax.jpg    1 directories scanned    1 image files read% exiftool -CreateDate="2011:11:25 12:00:00" ~/tmpWarning: Duplicate Orientation tag in IFD0 - /home/aboettger/tmp/relax.jpg    1 directories scanned    1 image files updated% exiftool -createdate ~/tmp                      ======== /home/aboettger/tmp/relax.jpgCreate Date                     : 2011:11:25 12:00:00    1 directories scanned    1 image files read% exiftool '-filename<CreateDate' -d %y%m%d_%H%M%S%%-c.%%le  ~/tmp    1 directories scanned    1 image files updated% ls -log ~/tmp total 56-rw-rw-r-- 1 16501 Nov 25 10:04 111125_120000.jpg-rw-rw-r-- 1  16473 Nov 25 09:55 relax.jpg_original