Essential Upgrade

 Essential Upgrade

One or more essential packages are
currently out of date. if these
upgrades are not performed you are
likely to encounter errors.


upgrade essential

complete upgrade

lgnore(Temporary)
我选了第一个，怎么画面停楼在updating sources

                                                downloading packages

第一个：更新必要组件
第二个：全面更新
第三个：忽略（暂时性的）

这个现在可以忽略，但以后会再弹出来。如果是信得过的程序就全面更新吧，如果空间紧就第一个，可是少装一点东西。