Re: Ubuntu 10.10 installation doesn't detect hard drive
Couple of ideas ...
First, 10.10 uses Ext4, not Ext3. That could be why it won't let you select the partition even if it DOES see it. Reformat it as Ext4 and see if that makes any difference.
Second, I've first-hand experience with situations in which the alternate CD installer handles partitioning a lot better than the desktop CD. Don't ask me why -- as they are both supposed to be using the same installer -- but I've seen that myself.
So, if the first change doesn't work, download the Alternate CD and see if that installer is able to see either the Ext4 partition, or after you remove it, the free space.
Ubuntu 15.04 Mate, Mint 17.1; MS Win 8.1, Win10 TP.
Will not respond to PM requests for support -- use the forums.