you want to upgrade.  seems to me the easiest, quickest, and most
trustworthy way to proceed is reinstall.

experience taught me long ago reinstalling is your friend, far easier than
sorting out a confusing mess.  also, many major upgrades haven't worked
properly without reinstalling.  sometimes raid formats have changed,
sometimes the upgrade process just leaves a nonworking mess and you need to
reinstall anyway.

and while you're at it setup your discs so you have 2 complete and distinct
installations simultaneously.  that way the next time around you can
install the next before/without overwriting what's working.

it's easiest to use the installer to do your partitioning.

i have 2 discs and build raid1 sets by setting the 2 discs up with
identical partitions, on each disc i put two 300mb boot partitions, two
10gig swap partitions, and the rest of the space equally divided between
two lvm partitions.

the swap could be within the lvm, but there have been times i've been happy
to have partitions i could play with without destroying either
installation.  if you want more swap later you can add additional swap from
within the lvm.

you can even change your mind later about having 2 sets and absorb the
second lvm into the first.  just like you can add more salt later but you
can't take out what's already in the stew.
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