Anonymous
it thinks I manually installed all these
“manually (explicitly) installed”
When you (or your scripted operation) perform an apt-get install _____ packagename operation, explicitly naming a given package, its status will be marked “manually installed”. Similarly, on Day1 when booting the stock distribution, most of the pre-installed packages bear that same status (manually installed) b/c they were explicitly listed during the scripted build-iso operation.