There is (or was) a misformed expression in the acroread script. Execute acroread from the command line and see what the error is. If the error is 'expr: syntax error', then it's the misformed expression. You can fix it by opening acroread in an editor. Look for this line:
Code:
echo $mfile| sed 's/libgtk-x11-\([0-9]*\).0.so.0.\([0-9]\)00.\([0-9]*\)\|\(.*\)/\1\2\3/g'
Replace it with this line:
Code:
echo $mfile| sed 's/libgtk-x11-\([0-9]*\).0.so.0.\([0-9]*\)00.\([0-9]*\)\|\(.*\)/\1\2\3/g'
If you get a different error, then post the error. Right now you haven't provided enough information to be able to troubleshoot your problem.