Do you mean this? this dpkg --add-architecture i386
root@Linux-U:/home/d3ad# apt-get update
Ign:1
http://deb.debian.org/debian stretch InRelease
Ign:2
http://deb.debian.org/debian stretch/updates InRelease
Get:3
http://deb.debian.org/debian stretch-updates InRelease [91.0 kB]
Hit:4
http://deb.debian.org/debian stretch Release
Ign:5
http://deb.debian.org/debian stretch/updates Release
Hit:6
http://repo.steampowered.com/steam precise InRelease
Ign:7
http://deb.debian.org/debian stretch/updates/main Sources
Ign:8
http://deb.debian.org/debian stretch/updates/main i386 Packages
Ign:9
http://deb.debian.org/debian stretch/updates/main all Packages
Ign:11
http://deb.debian.org/debian stretch/updates/main amd64 Packages
Ign:12
http://deb.debian.org/debian stretch/updates/main Translation-en
Ign:13
http://deb.debian.org/debian stretch/updates/main Translation-en_US
Ign:14
http://deb.debian.org/debian stretch/updates/main all DEP-11 Metadata
Ign:15
http://deb.debian.org/debian stretch/updates/main amd64 DEP-11 Metadata
Ign:16
http://deb.debian.org/debian stretch/updates/main DEP-11 64x64 Icons
Ign:17
http://deb.debian.org/debian stretch/updates/main amd64 Contents (deb)
Ign:18
http://deb.debian.org/debian stretch/updates/main i386 Contents (deb)
Ign:19
http://deb.debian.org/debian stretch/updates/main all Contents (deb)
Ign:20
http://deb.debian.org/debian stretch/updates i386 Contents (deb)
Ign:21
http://deb.debian.org/debian stretch/updates all Contents (deb)
Ign:22
http://deb.debian.org/debian stretch/updates amd64 Contents (deb)
Ign:7
http://deb.debian.org/debian stretch/updates/main Sources
Ign:8
http://deb.debian.org/debian stretch/updates/main i386 Packages
Ign:9
http://deb.debian.org/debian stretch/updates/main all Packages
Ign:11
http://deb.debian.org/debian stretch/updates/main amd64 Packages
Ign:12
http://deb.debian.org/debian stretch/updates/main Translation-en
Ign:13
http://deb.debian.org/debian stretch/updates/main Translation-en_US
Ign:14
http://deb.debian.org/debian stretch/updates/main all DEP-11 Metadata
Ign:15
http://deb.debian.org/debian stretch/updates/main amd64 DEP-11 Metadata
Ign:16
http://deb.debian.org/debian stretch/updates/main DEP-11 64x64 Icons
Ign:17
http://deb.debian.org/debian stretch/updates/main amd64 Contents (deb)
Ign:18
http://deb.debian.org/debian stretch/updates/main i386 Contents (deb)
Ign:19
http://deb.debian.org/debian stretch/updates/main all Contents (deb)
Ign:20
http://deb.debian.org/debian stretch/updates i386 Contents (deb)
Ign:21
http://deb.debian.org/debian stretch/updates all Contents (deb)
Ign:22
http://deb.debian.org/debian stretch/updates amd64 Contents (deb)
Ign:7
http://deb.debian.org/debian stretch/updates/main Sources
Ign:8
http://deb.debian.org/debian stretch/updates/main i386 Packages
Ign:9
http://deb.debian.org/debian stretch/updates/main all Packages
Ign:11
http://deb.debian.org/debian stretch/updates/main amd64 Packages
Ign:12
http://deb.debian.org/debian stretch/updates/main Translation-en
Ign:13
http://deb.debian.org/debian stretch/updates/main Translation-en_US
Ign:14
http://deb.debian.org/debian stretch/updates/main all DEP-11 Metadata
Ign:15
http://deb.debian.org/debian stretch/updates/main amd64 DEP-11 Metadata
Ign:16
http://deb.debian.org/debian stretch/updates/main DEP-11 64x64 Icons
Ign:17
http://deb.debian.org/debian stretch/updates/main amd64 Contents (deb)
Ign:18
http://deb.debian.org/debian stretch/updates/main i386 Contents (deb)
Ign:19
http://deb.debian.org/debian stretch/updates/main all Contents (deb)
Ign:20
http://deb.debian.org/debian stretch/updates i386 Contents (deb)
Ign:21
http://deb.debian.org/debian stretch/updates all Contents (deb)
Ign:22
http://deb.debian.org/debian stretch/updates amd64 Contents (deb)
Ign:7
http://deb.debian.org/debian stretch/updates/main Sources
Ign:8
http://deb.debian.org/debian stretch/updates/main i386 Packages
Ign:9
http://deb.debian.org/debian stretch/updates/main all Packages
Ign:11
http://deb.debian.org/debian stretch/updates/main amd64 Packages
Ign:12
http://deb.debian.org/debian stretch/updates/main Translation-en
Ign:13
http://deb.debian.org/debian stretch/updates/main Translation-en_US
Ign:14
http://deb.debian.org/debian stretch/updates/main all DEP-11 Metadata
Ign:15
http://deb.debian.org/debian stretch/updates/main amd64 DEP-11 Metadata
Ign:16
http://deb.debian.org/debian stretch/updates/main DEP-11 64x64 Icons
Ign:17
http://deb.debian.org/debian stretch/updates/main amd64 Contents (deb)
Ign:18
http://deb.debian.org/debian stretch/updates/main i386 Contents (deb)
Ign:19
http://deb.debian.org/debian stretch/updates/main all Contents (deb)
Ign:20
http://deb.debian.org/debian stretch/updates i386 Contents (deb)
Ign:21
http://deb.debian.org/debian stretch/updates all Contents (deb)
Ign:22
http://deb.debian.org/debian stretch/updates amd64 Contents (deb)
Ign:7
http://deb.debian.org/debian stretch/updates/main Sources
Ign:8
http://deb.debian.org/debian stretch/updates/main i386 Packages
Ign:9
http://deb.debian.org/debian stretch/updates/main all Packages
Ign:11
http://deb.debian.org/debian stretch/updates/main amd64 Packages
Ign:12
http://deb.debian.org/debian stretch/updates/main Translation-en
Ign:13
http://deb.debian.org/debian stretch/updates/main Translation-en_US
Ign:14
http://deb.debian.org/debian stretch/updates/main all DEP-11 Metadata
Ign:15
http://deb.debian.org/debian stretch/updates/main amd64 DEP-11 Metadata
Ign:16
http://deb.debian.org/debian stretch/updates/main DEP-11 64x64 Icons
Ign:17
http://deb.debian.org/debian stretch/updates/main amd64 Contents (deb)
Ign:18
http://deb.debian.org/debian stretch/updates/main i386 Contents (deb)
Ign:19
http://deb.debian.org/debian stretch/updates/main all Contents (deb)
Ign:20
http://deb.debian.org/debian stretch/updates i386 Contents (deb)
Ign:21
http://deb.debian.org/debian stretch/updates all Contents (deb)
Ign:22
http://deb.debian.org/debian stretch/updates amd64 Contents (deb)
Err:7
http://deb.debian.org/debian stretch/updates/main Sources
404 Not Found [IP: 2a04:4e42:1b::204 80]
Ign:8
http://deb.debian.org/debian stretch/updates/main i386 Packages
Ign:9
http://deb.debian.org/debian stretch/updates/main all Packages
Ign:11
http://deb.debian.org/debian stretch/updates/main amd64 Packages
Ign:12
http://deb.debian.org/debian stretch/updates/main Translation-en
Ign:13
http://deb.debian.org/debian stretch/updates/main Translation-en_US
Ign:14
http://deb.debian.org/debian stretch/updates/main all DEP-11 Metadata
Ign:15
http://deb.debian.org/debian stretch/updates/main amd64 DEP-11 Metadata
Ign:16
http://deb.debian.org/debian stretch/updates/main DEP-11 64x64 Icons
Ign:17
http://deb.debian.org/debian stretch/updates/main amd64 Contents (deb)
Ign:18
http://deb.debian.org/debian stretch/updates/main i386 Contents (deb)
Fetched 91.0 kB in 9s (9,506 B/s)
Reading package lists... Done
W: The repository '
http://deb.debian.org/debian stretch/updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch
http://deb.debian.org/debian/dists/stre ... ce/Sources 404 Not Found [IP: 2a04:4e42:1b::204 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.