/usr/lib/mime/packages/okular is in okular 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | application/pdf; okular '%s'; nametemplate=%s.pdf; test=test "$DISPLAY" != ""; priority=6
application/x-pdf; okular '%s'; nametemplate=%s.pdf; test=test "$DISPLAY" != ""; priority=6
application/x-gzpdf; okular '%s'; nametemplate=%s.pdf.gz; test=test "$DISPLAY" != ""; priority=6
application/x-bzpdf; okular '%s'; nametemplate=%s.pdf.bz2; test=test "$DISPLAY" != ""; priority=6
application/postscript; okular '%s'; nametemplate=%s.ps; test=test "$DISPLAY" != ""; priority=5
application/z-gzpostscript; okular '%s'; nametemplate=%s.ps.gz; test=test "$DISPLAY" != ""; priority=5
application/x-bzpostscript; okular '%s'; nametemplate=%s.ps.bz2; test=test "$DISPLAY" != ""; priority=5
image/x-eps; okular '%s'; nametemplate=%s.eps; test=test "$DISPLAY" != ""; priority=5
image/x-bzeps; okular '%s'; nametemplate=%s.eps.bz2; test=test "$DISPLAY" != ""; priority=5
image/x-gzeps; okular '%s'; nametemplate=%s.eps.gz; test=test "$DISPLAY" != ""; priority=5
application/x-dvi; okular '%s'; nametemplate=%s.dvi; test=test "$DISPLAY" != ""; priority=4
application/x-gzdvi; okular '%s'; nametemplate=%s.dvi.gz; test=test "$DISPLAY" != ""; priority=4
application/x-bzdvi; okular '%s'; nametemplate=%s.dvi.bz2; test=test "$DISPLAY" != ""; priority=4
application/x-cbr; okular '%s'; nametemplate=%s.cbr; test=test "$DISPLAY" != ""; priority=4
application/x-cbz; okular '%s'; nametemplate=%s.cbz; test=test "$DISPLAY" != ""; priority=4
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