Comment 4 for bug 1664983

Since upgrading to Cinnamon 18.1 I have been plagued with this problem. Using the "Fix" as administrator does not help. Deleting .cache/thumbnails and .thunbnails does not help either. I just did all that and the first .jpg file I moved gave the dreaded message again.

"A problem has been detected with your thumbnail cache. Fixing it will require administrative privileges."