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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?

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2 Answers

Apparently, in addition to /etc/apt/sources.list there is also /etc/apt/sources.list.d directory, that allows you to have additional package lists thrown in. In my case, I have

$ ls -l /etc/apt/sources.list.d
total 4
-rw-r--r-- 1 root root 94 2010-12-16 12:15 sid.list

which was apparently added by my VDS provider for some reason.

According to man,

The /etc/apt/sources.list.d directory provides a way to add sources.list entries in separate files. The format is the same as for the regular sources.list file. File names need to end with .list and may only contain letters (a-z and A-Z), digits (0-9), underscore (_), hyphen (-) and period (.) characters. Otherwise they will be silently ignored.

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It looks like you're in a chroot environment, verify with something like this:

[ "$(stat -c %d:%i /)" != "$(stat -c %d:%i /proc/1/root/.)" ] && echo "I'm in a chroot" || echo "main system"

And if so, simply type exit to quit.

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