[Charlug] Upgrading old Ubuntu

[Pierre Abbat]

I'm running feisty, which has expired, and I'm trying to upgrade to gutsy. 
(I'm usually too busy to risk having the computer down for a couple of days 
because of upgrade problems.) I put old-releases in /etc/apt/sources.list, so 
I can still get feisty packages. The problem appears to be that, if I 
have "us.archive.ubuntu.com feisty" enabled, the upgrade manager complains 
because it can't get a package list from there, but if I disable it, it can't 
find the gutsy packages because they're in "us.archive.ubuntu.com gutsy". How 
can I fix it so that the upgrade works?

Is it okay to run the upgrade manager in Konsole? Or should I log out before I 
start and run it in text mode? Is there a way to download all the packages, 
but not install them, and then install them later? Do I have to dump all my 
Postgres databases?

Pierre