Debian - “警告：将安装以下软件包的不受信任版本！”

Question

当我尝试安装或更新任何软件包时，我得到：

Untrusted packages could compromise your system's security. You should only proceed with the installation if you are certain that this is what you want to do.

我强烈怀疑这与我在更新时遇到的错误有关：

$ sudo aptitude update
Get: 1 http://ftp.us.debian.org wheezy InRelease [208 kB]
Get: 2 http://debian.lcs.mit.edu wheezy InRelease [208 kB]
Ign http://ftp.us.debian.org wheezy InRelease
Hit http://ftp.us.debian.org wheezy/main amd64 Packages/DiffIndex
Hit http://ftp.us.debian.org wheezy/contrib amd64 Packages/DiffIndex
Hit http://ftp.us.debian.org wheezy/non-free amd64 Packages/DiffIndex
Hit http://ftp.us.debian.org wheezy/contrib Translation-en
Hit http://ftp.us.debian.org wheezy/main Translation-en
Hit http://ftp.us.debian.org wheezy/non-free Translation-en
Get: 3 http://debian.lcs.mit.edu wheezy-updates InRelease [116 kB]
Ign http://debian.lcs.mit.edu wheezy InRelease
Ign http://debian.lcs.mit.edu wheezy-updates InRelease
Hit http://debian.lcs.mit.edu wheezy/main Sources/DiffIndex
Hit http://debian.lcs.mit.edu wheezy/main amd64 Packages/DiffIndex
Hit http://debian.lcs.mit.edu wheezy/main Translation-en
Ign http://ftp.us.debian.org wheezy/contrib Translation-en_US
Ign http://debian.lcs.mit.edu wheezy-updates/main Sources/DiffIndex
Ign http://debian.lcs.mit.edu wheezy-updates/main amd64 Packages/DiffIndex
Ign http://ftp.us.debian.org wheezy/main Translation-en_US
Ign http://ftp.us.debian.org wheezy/non-free Translation-en_US
Hit http://debian.lcs.mit.edu wheezy-updates/main Sources
Hit http://debian.lcs.mit.edu wheezy-updates/main amd64 Packages
Ign http://debian.lcs.mit.edu wheezy/main Translation-en_US
Ign http://debian.lcs.mit.edu wheezy-updates/main Translation-en_US
Ign http://debian.lcs.mit.edu wheezy-updates/main Translation-en
Fetched 531 kB in 1s (304 kB/s)
W: GPG error: http://ftp.us.debian.org wheezy InRelease: Unknown error executing gpgv
W: GPG error: http://debian.lcs.mit.edu wheezy InRelease: Unknown error executing gpgv
W: GPG error: http://debian.lcs.mit.edu wheezy-updates InRelease: Unknown error executing gpgv

我试过重新安装钥匙圈：（ sudo aptitude reinstall debian-archive-keyring 这令人惊讶地不会引起警告）。

Answer 1

请试试这个：

打开终端并运行以下命令：

sudo apt-get clean
sudo rm -rf /var/lib/apt/lists/*
sudo apt-get clean
sudo apt-get update