I don't had the problem with an old install from: Ubuntu 17.04 "Zesty Zapus" - 
Alpha amd64 (20161106)
so I'm trying to give some more info.

I started with:

Ubuntu installed from: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 (20161106)
NEVER updated:
corrado@corrado-z-nov16:~$ uname -a
Linux corrado-z-nov16 4.10.0-8-generic #10-Ubuntu SMP Mon Feb 13 14:04:59 UTC 
2017 x86_64 x86_64 x86_64 GNU/Linux
corrado@corrado-z-nov16:~$ 

attached: BeforeUpdates: log .cache .config .local inxi screenshot
thumbnails where created ok - see screenshot

Then I Run apt-get update + upgrade

attached: After1stUpdate: installer Pictures .cache .config .gconf .local 
varous logs 
thumbnails created wrong. see last 2 thumbnails

I restarted, but ubuntu started in low graphic mode. Restarted in
emergency mode. Run update + upgrade + dist-upgrade. attached:
2ndUpgrade: varoius logs.

Restart again. now all seems ok BUT thumbnails are wrong. 
attached: AfterLastUpgrade: a lot of data. thumbnails wrong for .jpg and .png. 
Good thumbnail for .tiff

I still have a copy of the old iso: Ubuntu 17.04 "Zesty Zapus" - Alpha amd64 
(20161106)
so I may reistall it and produce more doc.
Let my know if You need.
bye 

** Attachment added: "Some doc about this problem. Hoping to help"
   
https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/1665602/+attachment/4826555/+files/thumbs.tar.gz

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https://bugs.launchpad.net/bugs/1665602

Title:
  nautilus no thumbnails for .jpg and .png

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