Hi Rob, you've missed important part of the command - "sudo" prefix which will grant you required permissions without password. To change the TeamCity version number open <a href="https://portal.azure.com" target="_blank" rel="nofollow">Azure portal</a>, navigate to the Resource groups -> %teamcity resource group name%, click on the "teamcity" VM and select "Tags" tab where you'll find the "teamcity-version" tag.
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