pdf viewer doesn’t work in Kile Ubuntu

After installing Kile, I got the problem that after I compile the text file I couldn’t open pdf by using ViewPDF (Alt+7).
The log window is shown the message “[ViewPDF] exit code 127. <file name>.pdf (okular). The problem is I don’tinstall okular yet so the solution for this problem is

sudo apt-get install okular

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