Changes made in https://github.com/stuvusIT/systemd-timesyncd/commit/dac573caffe70f47496cdc9b2d25ab6c1e1be55e depend on Aptitude being installed on the target server, which is generally not true - it fails on current Ubuntu LTS ( and IIRC Debian Stable doesn't install Aptitude either). The code is somewhat suspicious too: systemd-timesyncd might not be installable, but we start the unit anyway?
Changes made in https://github.com/stuvusIT/systemd-timesyncd/commit/dac573caffe70f47496cdc9b2d25ab6c1e1be55e depend on Aptitude being installed on the target server, which is generally not true - it fails on current Ubuntu LTS ( and IIRC Debian Stable doesn't install Aptitude either). The code is somewhat suspicious too: systemd-timesyncd might not be installable, but we start the unit anyway?
I created a PR to fix the issue: https://github.com/stuvusIT/systemd-timesyncd/pull/17
EDIT. better explain what was tested