Source: systemd Version: 247.3-5 I noticed that systemd-machined was failing to start on an arm64 box. This box had armhf enabled, and turns out systemd had been cross-graded over to systemd:armhf[*]. It still had systemd-container:arm64 installed, so now I had an arm64 /lib/systemd/systemd-machine, but an armhf /lib/systemd/libsystemd-shared-244.so.
libsystemd-shared-244.so is from the systemd package. Since systemd is marked Multi-Arch: foreign, systemd:armhf was able to incorrectly satisfy systemd-container:arm64's dependency on systemd. [*] kudos to Multi-Arch that I simply hadn't noticed
