Resize XP partition for more Ubuntu space

[Charles Malespin]

> > >  
> > > Yes, umount the partition before you resize it..
> > >
> > Ok, I did that and when I try to click on the partition in Gparted or
> > qtparted it says that it cant read that partition and wont let me resize
> > it...  Did I do something wrong or is there something I forgot to do?
> 
> The package qtparted recommends the package ntfsprogs. Do you have that
> package installed? If not, that's probably what you need.

Ok, I installed the ntfsprogs package and was able to take the 60 Gb off
the windows partition.  Now I have this 
/dev/sda1     Fat16       63 Mb
/dev/sda2     Ntfs	  20.5 Gb
Unallocated               65.5 Gb
/dev/sda3     ext3        102 Mb
/dev/sda4     extended    67 Gb
  /dev/sda5   ext 3       64 Gb
  /dev/sda6   swap        2.5 Gb

But I cant resize my extended partition so that I can use the free space
that I just made.... Am I missing another package, or what?  It tells me
in Gparted that the status of my /dev/sda4 is busy(at least one logical
partition is mounted).  Any help?