Debian update source times wrong

Hit http://mirrors.sohu.com Stable/main TRANSLATION-ZH_CN
Hit http://mirrors.sohu.com Stable/main Translation-zh
Get: 1 http://mirrors.sohu.com stable/main translation-en [4,583 KB]
Get: 2 http://mirrors.sohu.com stable/non-free translation-en [72.3 KB]
Download 2 B, time consuming 1 seconds (1 b/s)
W: The key for the following ID does not have a public key available:
7638d0442b90d010
No_pubkey cbf8d6fd518e17e1
W: Unable to download bzip2:/var/lib/apt/lists/partial/mirrors.sohu.com_debian_dists_stable_main_i18n_translation-en Hash checksum mismatch
W: Unable to download Bzip2:/var/lib/apt/lists/partial/mirrors.sohu.com_debian_dists_stable_non-free_i18n_translation-en Hash Checksum mismatch

E:some index files failed to download. They have been ignored, or old ones used.

Solution:

root@i2test:~# gpg--keyserver pgpkeys.mit.edu--recv-keys c857c906
GPG: Download key ' c857c906 ' from HKP server pgpkeys.mit.edu
GPG:/root/.gnupg/trustdb.gpg: Build a Trust database
GPG: Key c857c906: Public key "Debian security Archive Automatic signing Key (8/jessie) <ftpmaster@debian.org>" imported
GPG: No absolute trust key was found
GPG: Total Processed Quantity: 1
GPG: Imported: 1 (rsa:1)
root@i2test:~# gpg--export--armor c857c906 | sudo apt-key add-
Ok
root@i2test:~#

Http://www.cnblogs.com/aobosir/p/5928627.html