periodic upgrade

[Thufir]

I have an older computer and a slowish connection.  How can I get apt to 
upgrade one package at a time?  Generally, if you upgrade it will 
download all the packages and then, once they're downloaded, upgrade.

I suppose the other approach is to set apt to just download packages and 
then at a later date, once they're all downloaded, upgrade all the 
packages.  I've never been really clear on how to know when the packages 
are downloaded or what the next step is.


https://help.ubuntu.com/12.04/serverguide/automatic-updates.html

doesn't really make it clear, at least to me, how to set apt to simply 
download, and then how to know when it's done, and then how actually 
upgrade from what's been downloaded.

I just went from 11.10 to 12.04 and don't relish upgrading all the 
packages in one go.



thanks,


Thufir