I also met this problem yesterday,and I don't remember what I did .
Now it works well useing the way you mentioned.
But I think it is not a good way to solve this problem.
Probably we should modify the file locate ~/.local/share/applications/x-extension-pdf.xml
but I don't know how do deal with it .
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oh
I also met this problem yesterday,and I don't remember what I did .
Now it works well useing the way you mentioned.
But I think it is not a good way to solve this problem.
Probably we should modify the file locate ~/.local/share/applications/x-extension-pdf.xml
but I don't know how do deal with it .