Re: 10.10 install horror
It still sounds like you are doing something wrong with the install (something automatic instead of "manual" partitioning). So it split up the 250 GB partition, but not like you wanted it.
What you should do is boot to a live system from the install CD. Use gparted to remove that 250 GB partition (or whatever other partitions in got split into. Create your 240 GB partition as ext4, and 10 GB as swap. Then during install use manual partitioning to select your 240 GB partition as / and it will automatically find your swap.
At the bottom of that manual partition screen, select to put grub on /dev/sdb. Then set your BIOS to boot your second hard drive, and that will leave Windows and its mbr untouched. grub on sdb should be able to boot either Ubuntu on sdb or Windows on sda. That is basically what I did, except sdb is an SSD and I have 8 GB RAM, so I have no swap (which with that much RAM is only need for hibernate, suspend works without swap).
Then if something ever goes wrong or you decide you do not want to use Ubuntu, you can simply switch your boot drive back to your 1st drive and Windows should boot itself normally.
Some people may suggest using 3 partitions for /, /home, and swap. Not sure how much to allocate for each, but 50 GB should be plenty for / and swap just needs to be slightly larger than your RAM, so the rest could be /home.
i5 650 3.2 GHz upgraded to i7 870, 16 GB 1333 RAM, nvidia GTX 1060, 32" 1080p & assorted older computers
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