All signed InfluxData Linux packages have been resigned with an updated key.If using Linux, you may need to update your package configuration to continueto download and verify InfluxData software packages.
Agents can only be used to download extension packages and reporting status. For example, if an extension installation needs to download a script from GitHub (Custom Script extension) or needs access to Azure Storage (Azure Backup), then you need to open additional firewall or network security group (NSG) ports. Different extensions have different requirements, because they're applications in their own right. For extensions that require access to Azure Storage, you can allow access by using Azure NSG service tags.
You will have problems with other packages from your distribution's repos. This is exactly the case stated in the question: ubuntu has a great package manager and some very nice people maintaining the packages. And they have decided, that for the mailx program to work you need an MTA. So if you installed postfix from sources ubuntu wouldn't ask you to install exim.
In terms of downloading and applying updates, this timer unit behaves according to settings in the /etc/dnf/automatic.conf configuration file. The default behavior is similar to dnf-automatic-download.timer: it downloads the updated packages, but it does not install them. 1e1e36bf2d