root@mfus1006:~# apt-get update Hit http://security.debian.org wheezy/updates Release.gpg Hit http://security.debian.org wheezy/updates Release Hit http://ftp.debian.org wheezy Release.gpg Hit http://security.debian.org wheezy/updates/main i386 Packages Hit http://security.debian.org wheezy/updates/contrib i386 Packages Hit http://ftp.debian.org wheezy Release Hit http://security.debian.org wheezy/updates/non-free i386 Packages Hit http://security.debian.org wheezy/updates/contrib Translation-en Hit http://ftp.debian.org wheezy/main i386 Packages Hit http://security.debian.org wheezy/updates/main Translation-en Hit http://ftp.debian.org wheezy/contrib i386 Packages Hit http://security.debian.org wheezy/updates/non-free Translation-en Hit http://ftp.debian.org wheezy/non-free i386 Packages Hit http://ftp.debian.org wheezy/contrib Translation-en Hit http://ftp.debian.org wheezy/main Translation-en Hit http://ftp.debian.org wheezy/non-free Translation-en Reading package lists... Done W: There is no public key available for the following key IDs: 9D6D8F6BC857C906 W: There is no public key available for the following key IDs: 7638D0442B90D010

解决public key的问题的命令
命令一：
apt-get install debian-keyring debian-archive-keyring 命令二：
apt-key update
实例：
命令一：
root@mfus1006:~# apt-get install debian-keyring debian-archive-keyring Reading package lists... Done Building dependency tree Reading state information... Done debian-keyring is already the newest version. The following packages will be upgraded:   debian-archive-keyring 1 upgraded, 0 newly installed, 0 to remove and 79 not upgraded. Need to get 60.7 kB of archives. After this operation, 26.6 kB of additional disk space will be used. Do you want to continue [Y/n]? y 这里需要回答 y 确定 Get:1 http://ftp.debian.org/debian/ wheezy/main debian-archive-keyring all 2014.3~deb7u1 [60.7 kB] Fetched 60.7 kB in 0s (101 kB/s) (Reading database ... 30582 files and directories currently installed.) Preparing to replace debian-archive-keyring 2012.4 (using .../debian-archive-keyring_2014.3~deb7u1_all.deb) ... Unpacking replacement debian-archive-keyring ... Setting up debian-archive-keyring (2014.3~deb7u1) ...

命令二： root@mfus1006:~# apt-key update gpg: key B98321F9: "Squeeze Stable Release Key " not changed gpg: key 473041FA: "Debian Archive Automatic Signing Key (6.0/squeeze) " not changed gpg: key 65FFB764: "Wheezy Stable Release Key " not changed gpg: key 46925553: "Debian Archive Automatic Signing Key (7.0/wheezy) " not changed gpg: key 518E17E1: "Jessie Stable Release Key " not changed gpg: key 2B90D010: "Debian Archive Automatic Signing Key (8/jessie) " not changed gpg: key C857C906: "Debian Security Archive Automatic Signing Key (8/jessie) " not changed gpg: Total number processed: 7 gpg:              unchanged: 7

测试再次升级： root@mfus1006:~# apt-get update Hit http://ftp.debian.org wheezy Release.gpg Hit http://security.debian.org wheezy/updates Release.gpg Hit http://ftp.debian.org wheezy Release Hit http://security.debian.org wheezy/updates Release Hit http://security.debian.org wheezy/updates/main i386 Packages Hit http://ftp.debian.org wheezy/main i386 Packages Hit http://security.debian.org wheezy/updates/contrib i386 Packages Hit http://security.debian.org wheezy/updates/non-free i386 Packages Hit http://ftp.debian.org wheezy/contrib i386 Packages Hit http://security.debian.org wheezy/updates/contrib Translation-en Hit http://security.debian.org wheezy/updates/main Translation-en Hit http://ftp.debian.org wheezy/non-free i386 Packages Hit http://security.debian.org wheezy/updates/non-free Translation-en Hit http://ftp.debian.org wheezy/contrib Translation-en Hit http://ftp.debian.org wheezy/main Translation-en Hit http://ftp.debian.org wheezy/non-free Translation-en Reading package lists... Done   至此，已成功解决了public key的问题。

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