+If you are using Ubuntu, it is likely that the version of Xpdf
+installed with your system crashes on every PDF file: this state
+has been persisting for several years and is due to library
+mismatches. Your best bet is to install a current @samp{xpdf}
+package and the corresponding @samp{libpoppler} package from
+Debian instead. Once you have tested that this works, you might
+want to use
+@example
+sudo apt-mark hold xpdf
+@end example
+@noindent
+in order to keep Ubuntu from overwriting it with the next
+@q{update} of its crashing package.
+