Bug#445604: sitesummary: crontest failure
it seems that sitesummary cron files are giving output when the package itself is removed
(REMOVE) or its dependencies (AUTOREMOVE). See also policy 9.5 "Cron jobs" about this issue.
log available at:
REMOVE CRON.DAILY  ['/etc/cron.daily/sitesummary: line 51: sitesummary-nodes: command not found\n']
AUTOREMOVE CRON.DAILY  ['/etc/cron.daily/sitesummary: line 51: sitesummary-nodes: command not found\n']
you should check if sitesummary-nodes is present and executable.