This guide fixes the following Steam crash: Assertion 'device' failed at src/libsystemd/sd-device/device-private.c:103, function device_get_tags_generation(). Aborting. Solution 1. Enable 32-bit builds for libudev-compat Add the following to package.use: sys-libs/libudev-compat abi_x86_32 2. Install (or reinstall) libudev-compat Execute the following command: sudo emerge sys-libs/libudev-compat 3. Re-launch Open Steam again.