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12e2b22ea8
Bring configuration in line with the latest Cloud init verison. Tested under 20.1. Mainly done due to `debconf_selections` not working with the old syntac. See the `debconf_selections` item under https://cloudinit.readthedocs.io/en/latest/topics/modules.html#apt-configure Changes include: - reboot when apt deems it necessary, - define update and upgrade with the package syntax, - bring apt sources and keys inline with apt syntax and - dynamically get the right release by using the var '$RELEASE'. [ci skip]