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
~$
or…
~$ 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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