我不确定是什么导致了这个错误，但这是整个错误所说的内容，这也是一个通知，阻止我使用更新管理器更新任何软件 - 请提供一些帮助或告诉我如何找出什么做修复它。
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
Please report this bug against the 'update-manager' package and include the following error message:
'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'