I had an Ubuntu 9/Windows 7 dual boot. (I almost never use the Windows side, actually.)
Ubuntu was bugging me to update, so I tried it (backing up everything first). Somehow, the update failed (I think because someone turned the computer off at the socket half way through). The computer now refuses to boot into Ubuntu.
Now I have an Ubuntu 10.10 install disk. I want to use it to overwrite the existing Ubuntu installation, while leaving the Windows installation alone. I got as far as the advanced "select a partition" section, but I had no way of knowing which partition was which.
Edit to add:
What I have is
/dev/sda /dev/sda1 nfts /dev/sda2 nfts /dev/sda5 ext4 /dev/sda6 swap
So, I want to leave the NFTS partitions alone (why do I have two of them?) and install Ubuntu 10.10 on
/dev/sda5. Is that right? I'm not sure what
/dev/sda6 is used for. What is a "swap area" anyway? I think I'll leave it alone.
So I selected
/dev/sda5 and told the installer to use it as the "Ext4 journaling file system". The Install button lights up, but when I click it I'm told that no root file system is defined. How do I go about defining a root file system?
GParted shows this slightly differently: