How to install i386 package under amd64 ubuntu/debian

All existing answers I found are for the pre-multiarch era (chroot)
https://help.ubuntu.com/community/MultiArch says it is OK to install i386 package on amd64 under the multiarch environment, but doesn't say how.

So, how to install i386 package on amd64 under the ubuntu/debian multiarch environment?

This is the follow-up for Why I can't see Ubuntu restricted packages, where the sl-modem-daemon package doesn't have the amd64 but only i386 version in Ubuntu. Following https://askubuntu.com/questions/29665/how-do-i-apt-get-a-32-bit-package-on-a-64-bit-installation, I tried,

apt-get install sl-modem-daemon:i386

but still get the reply that package not found.

xpt

Posted 2014-04-14T02:53:29.553

Reputation: 5 548

Works on my machine. It is in restricted - did you enable that repository? – user55325 – 2014-04-14T04:59:40.407

No, so I guess the missing step is the "enabling that repository". How did you do that? – xpt – 2014-04-14T14:23:08.693

Start the "Software and Updates" tool (or go to the repository settings in Synaptic) and check the box called "Proprietary drivers for devices (restricted)". Then run apt-get update (if the package lists don't update automatically, which they might). – user55325 – 2014-04-14T21:48:47.573

As posted in http://superuser.com/questions/741368/why-i-cant-see-ubuntu-restricted-packages/741373, I've enabled the restricted repository (details there). Are you using i386 instead of Amd64?

– xpt – 2014-04-14T22:36:11.943

No, I'm using Kubuntu Saucy on amd64. Strange - if nothing else, assuming you have all the dependencies, you can always download the package and manually install it with dpkg -i --force-architecture. – user55325 – 2014-04-15T02:07:47.917

How to install i386 package under amd64 ubuntu/debian

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