Ubuntu Linux installer problems

If you are positive that there is a valid root file system on /dev/hdb2, then there is a way to bypass gparted's check. Before you run the installer type the following from a terminal:

sudo vi /usr/lib/ubiquity/ubiquity/validation.py

Find the lines that say:

if not root:
  result.add(MOUNTPOINT_NOROOT)

And change them to say:

if not root:
  pass

Save and exit the file and run the installer. Please thank the good Ubuntu users of this thread. They are the ones who discovered the solution.