A couple of things in the x11-common.config
script validate_nice_value() don't look right to me:
1) That "set +e ... set -e" seems -really- bogus.
That forces exit on non-zero exit status from
simple commands, and this script intentionally
invokes some simple commands that might exit
non-zero, such as the expr line on the very next
line after the "set +e".
2) I believe that expr can exit with 3 if asked to
subtract non-numbers. So I'd suggest changing
the line:
if [ $? -ne 2 ]; then
to be instead the line:
if [ $? -lt 2 ]; then
--
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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