I recently did a clean install of 10.04 on a Dell Inspiron 1525 laptop.
I partitioned the drive as follows

1GB Primary partition mounted at /boot
8GB Primary partition mounted as /
8GB Primary partition to attempt an LFS build
215GB Extended partition containing

4GB swap space
211GB Logical partition mounted as /home

I checked after the install that the partitions were as expected and
everything was hunky dory. However...

Last night, I had cause to go into gparted and discovered that my disk
now looks like this:

1M Unallocated space
976M Primary partition (/boot)
231.93M Extended partition containing

7.63G Logical partition (/)
1M Unallocated space
7.63G Logical partition (LFS)
1M Unallocated space
7.63G Swap space
1M Unallocated space
209.04G Logical partition (/home)

The unallocated sapce and different partition sizes I could just about
accept as the differences between what I asked for and what the disk
could physically do (although the near doubling in swap space is a
little harder to hand-wave away). But primary partitions suddenly
becoming logical ones!? WTF? Can *anyone* explain how this might be
even possible?