 <p>You have added the entry to root's crontab, while your Cloud SDK installation is setup for a different user (I am guessing ubu121lts).</p> <p>You should add the entry in ubu121lts's crontab using:</p> <pre><code>crontab -u ubu121lts -e </code></pre> <p>Additionally your entry is currently scheduled to run on the 0th minute every hour. Is that what you intended?</p>