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.
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