Ubuntu报错（E: Some packages could not be authenticated）
今天打开了我另一台电脑许久未开的虚拟机，打算作一波实验，很长时间不开了，安装新的软件时给我爆出了E: Some packages could not be authenticated错误，通过查找解决办法get 缘由： 表示系统没法验证这个软件包. 要想验证这个软件包, 则须要安装debian的公钥。 深层缘由： Debian的公钥有效期是1年, 也就是说没隔1年须要更换一次公钥.
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