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Apt update 说软件包可以升级，但 upgrade 却说相反

tag-icon • tag-icon apt upgrade updates ppa
Apt update 说软件包可以升级，但 upgrade 却说相反

几天来我一直遇到这个问题。当我运行时，sudo apt update它说

1 package can be upgraded. Run 'apt list --upgradable' to see it.

输出sudo apt list --upgradable -a为

[NAME]/unknown 3.1.2-2.1 amd64 [upgradable from: 3.0.1-19.1]
[NAME]/now 3.0.1-19.1 amd64 [installed,upgradable to: 3.1.2-2.1]

但sudo apt upgrade说没有什么可升级的

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

我甚至不明白它是否依赖于 Ubuntu 17.04 64 位版本或软件包存储库。更奇怪的是，它sudo apt-get update没有显示我有 1 个软件包需要升级，而是sudo apt-get upgrade说

The following packages have been kept back:
  [NAME]

解决方案：经过几次尝试（全部失败）后，我决定重新安装 Ubuntu，现在一切都很好。

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