apt-get upgrade 中止了如何恢复?

apt-get upgrade got aborted how to recover?

恐怕我犯了一个错误。

在执行 apt-get upgrade 时,我不小心退出了,因此中途中止了升级。现在我无法重新启动升级。

apt-get upgrade 表示没有要升级的包...

apt-get update 给出错误:

W: Failed to fetch http://security.debian.org/dists/wheezy/updates/main/binary-armel/Packages  Hash Sum mismatch

W: Failed to fetch http://security.debian.org/dists/wheezy/updates/contrib/binary-armel/Packages  Hash Sum mismatch

W: Failed to fetch http://security.debian.org/dists/wheezy/updates/non-free/binary-armel/Packages  Hash Sum mismatch

[several more of these]

我尝试了这些但没有结果:

使用 purge 和 autoremove 完全删除已安装的软件包,然后重试 update/upgrade。