Disable/remove unattended upgrades

[phlax]

the AMI images have unattended upgrades set it seems - which can lead to an error like:

E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 4587 (unattended-upgr)
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

in this particular case there is no need to install anything anyway - but i would guess that this is slowing things down, soaking net io and generally being undesirable - and we should be able to install without it failing

[phlax]

this makes me wonder what else is running on these AMIs and whether there is a more lightweight base image we could use that doesnt do this kind of thing - if its a "server" install its probably set up to serve php or similar

[mum4k]

+1 for using a simpler base image.