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I had to add i386 architecture to apt sources list to be able to install 32 bit package required for gaming.

My sources.list now look like this:

deb [arch=amd64,i386] https://deb.debian.org/debian/ bookworm main non-free contrib non-free-firmware
deb-src [arch=amd64,i386] https://deb.debian.org/debian/ bookworm main non-free contrib non-free-firmware
    
deb https://security.debian.org/debian-security bookworm-security main non-free contrib non-free-firmware
deb-src https://security.debian.org/debian-security bookworm-security main non-free contrib non-free-firmware
        
deb https://deb.debian.org/debian/ bookworm-updates main non-free contrib non-free-firmware
deb-src https://deb.debian.org/debian/ bookworm-updates main non-free contrib non-free-firmware

To install the package adding i386 was required only for first line, but I'm not sure if I should add the arch to all lines?

For instance if I don't does this mean that the package won't be updated when using apt update?

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On debian, if you have enabled multiarch using sudo dpkg --add-architecture i386, you don't need to set the arch= in your sources.list.

Setting up apt sources. explained on Debian Wiki.

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    Yes I did sudo dpkg --add-architecture i386, didn't know I don't need to add into sources.list as well, thanks. Commented Jan 24, 2024 at 13:38
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    But I would appreciate to know, if I didn't, would I need to modify all lines then? Commented Jan 24, 2024 at 13:40
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    @metablaster typically you need to use the architecture option in your sources if you want something other than what dpkg expects (e.g., only a specific architecture, or specific set of architectures, for a specific repo) Commented Jan 24, 2024 at 13:40
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    @metablaster I have added a link to the debian wiki. Commented Jan 24, 2024 at 13:47
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    I have read it, thanks! is also says Arch-qualifying deb-src lines doesn't make any sense, good to know! Commented Jan 24, 2024 at 13:51

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