Source: activity-log-manager Version: 0.8.0-1.2 Severity: serious activity-log-manager depends on python-zeitgeist. However, the latest zeitgeist package in Debian dropped python-zeitgeist (no longer built from source) and now provides python3-zeitgeist.
Like with https://bugs.debian.org/885256 this can be fixed by upgrading activity-log-manager to the 0.9 series available in Ubuntu which has switched from python to vala. Thanks, Jeremy Bicha