I think you may need to rebuild them differently from this in order to have it work. I just installed zlib1g-dev:i386 and :amd64 to have an example to look at. Each of these packages contains the same files under /usr/share and /usr/include, and dpkg happily installed them both without special flags on my part. Try “apt-get source liburcu-dev”, and edit the debian/control file’s Multi-Arch line for liburcu-dev. Then rebuild it and see if it behaves differently when you try to install them both at the same time.
2. I fetched .deb files for both, extracted them using, dpkg-deb -R liburcu-dev_0.9.1-3_amd64.deb rcupackage_amd64 dpkg-deb -R liburcu-dev_0.9.1-3_i386.deb rcupackage_i386 3. Added 'Multi-Arch: same' to DEBIAN/control file for both packages. 4. Re-packaged them using, dpkg-deb -b rcupackage_amd64 rcupackage_amd64.deb dpkg-deb -b rcupackage_i386 rcupackage_i386.deb 5. Installed both using, sudo dpkg -i rcupackage_amd64.deb; sudo apt install -f sudo dpkg -i --force-overwrite rcupackage_i386.deb; sudo apt install -f The overwrite was done for files in /usr/share/doc/liburcu-dev/examples/ and file /usr/include/urcu/config.h. In this way, I was able to install both and use them for what I wanted. But how to avoid the clash of files? I understand that we have these different names usr/lib/i386-linux-gnu and usr/lib/x86_64-linux-gnu. Thanks, Rehas
