cdebconf优先级
FROM: cdebconf-0.114/debian/cdebconf-udeb.templates Packages that use debconf for configuration prioritize the questions they might ask you. Only questions with a certain priority or higher are actually shown to you; all less important questions are skipped. You can select the lowest priority of question you want to see: ‘critical’ is for items that will probably break the system without user intervention. ‘high’ is for items that don’t have reasonable defaults. ‘medium’ is for normal items that have reasonable defaults. ’low’ is for trivial items that have defaults that will work in the vast majority of cases.