My earlier patch (in this thread), replaces the contents of
validate_nice_value() function with a single line:

test "$1" -ge -20 -a "$1" -le 19 2> /dev/null

The patch I submitted was against the broken version (7.2.0ubuntu4 with
"$? -ne 1"), but the same idea works with the not-so-broken one.

BTW, the other {x11-common,xserver-xorg}.{prerm,postinst} scripts have
some evil looking expr's too.

-- 
x11-common loop asking 'Please enter an integer between -20 and 19.' at debconf 
medium or higher
https://launchpad.net/bugs/68267

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