I have a machine with Debian Lenny installed. Somehow, when I do apt-get update, I receive this output:
sudo apt-get update
Get:1 http://ftp.de.debian.org lenny Release.gpg [1034B]
Ign http://ftp.de.debian.org lenny/main Translation-en_US
Ign http://ftp.de.debian.org lenny/contrib Translation-en_US
Get:2 http://mirror.yandex.ru sid Release.gpg [836B]
Ign http://ftp.de.debian.org lenny/non-free Translation-en_US
Hit http://ftp.de.debian.org lenny/volatile Release.gpg
Ign http://ftp.de.debian.org lenny/volatile/main Translation-en_US
Ign http://ftp.de.debian.org lenny/volatile/contrib Translation-en_US
Ign http://ftp.de.debian.org lenny/volatile/non-free Translation-en_US
Hit http://ftp.de.debian.org lenny/updates Release.gpg
Ign http://ftp.de.debian.org lenny/updates/main Translation-en_US
Ign http://ftp.de.debian.org lenny/updates/contrib Translation-en_US
Ign http://ftp.de.debian.org lenny/updates/non-free Translation-en_US
Ign http://mirror.yandex.ru sid/main Translation-en_US
Hit http://ftp.de.debian.org lenny Release
Hit http://ftp.de.debian.org lenny/volatile Release
Hit http://ftp.de.debian.org lenny/updates Release
Hit http://mirror.yandex.ru sid Release
Ign http://ftp.de.debian.org lenny/main Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/contrib Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/non-free Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/volatile/main Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/volatile/contrib Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/volatile/non-free Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/updates/main Packages/DiffIndex
Hit http://mirror.yandex.ru sid/main Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/updates/contrib Packages/DiffIndex
Ign http://ftp.de.debian.org lenny/updates/non-free Packages/DiffIndex
Hit http://ftp.de.debian.org lenny/main Packages
Hit http://ftp.de.debian.org lenny/contrib Packages
Hit http://ftp.de.debian.org lenny/non-free Packages
Hit http://ftp.de.debian.org lenny/volatile/main Packages
Hit http://ftp.de.debian.org lenny/volatile/contrib Packages
Hit http://ftp.de.debian.org lenny/volatile/non-free Packages
Hit http://ftp.de.debian.org lenny/updates/main Packages
Hit http://ftp.de.debian.org lenny/updates/contrib Packages
Hit http://ftp.de.debian.org lenny/updates/non-free Packages
Hit http://mirror.yandex.ru sid/main Sources/DiffIndex
Fetched 1870B in 2s (833B/s)
Reading package lists... Done
The most strange thing, my /etc/apt/sources.list file looks like this:
deb http://ftp.de.debian.org/debian lenny main contrib non-free
deb http://ftp.de.debian.org/debian-volatile lenny/volatile main contrib non-free
deb http://ftp.de.debian.org/debian-security lenny/updates main contrib non-free
How I can rid of sid mirror being thrown in?