Documenting Problems That Were Difficult To Find The Answer To

Thunar and Ristretto on Xubuntu 14.04 Do Not Render Thumbnails

I was puzzled and searching all over the Internet for an explanation why the file explorer (Thunar) and the image viewer (Ristretto) were not displaying thumbnails for JPEG files. I know they had rendered them before. I tried all sorts of things, deleting local cache (~/.thumbnails/* and ~/.cache/thumbnails/*), ensuring various packages had been installed.

Finally I stumbled across this forum post which gave the necessary clue:

A package called tumbler is needed for thunar to automatically generate thumbnails.

I checked to see that I had tumbler:

~$ dpkg -l |grep tumbler
ii  libtumbler-1-0  0.1.30-1ubuntu1  amd64  library for tumbler, a D-Bus thumbnailing service
ii  tumbler         0.1.30-1ubuntu1  amd64  D-Bus thumbnailing service
ii  tumbler-common  0.1.30-1ubuntu1  all    D-Bus thumbnailing service (common files)

Then I checked to see if a tumbler process was running, and proceeded to kill it:

~$ ps fax |grep tumbler
21322 ?        SNl    0:01          \_ /usr/lib/x86_64-linux-gnu/tumbler-1/tumblerd
~$ kill 21322
~$ ps fax |grep tumbler


~$ killall tumblerd

Now when I opened a thunar file explorer the thumbnails were being rendered, and also rendered in ristretto, too.

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