The most recent upload of sssd for Ubuntu makes libnss-sss a multiarch package, which means that once multiarch is turned on by default in the package manager, you will be able to install 'libnss-sss:i386' to get the 32-bit .so.
This will not (yet) be pulled in by default because cross-architecture depends/recommends are currently not allowed by the package manager.
The most recent upload of sssd for Ubuntu makes libnss-sss a multiarch package, which means that once multiarch is turned on by default in the package manager, you will be able to install 'libnss-sss:i386' to get the 32-bit .so.
This will not (yet) be pulled in by default because cross-architecture depends/recommends are currently not allowed by the package manager.