I am new to Ubuntu. I recently decided to install Ubuntu 12.10 alongside Windows 7. I did this by shrinking my Windows partition, and then creating two Linux partitions - one btrfs and one swap partition. (I did this after reading some positive btrfs stuff on some forums). All this using DVD created by download from Ubuntu site.
All worked fine - I tried Windows 7 - loaded fine, and then Ubuntu which also loaded fine. Then I went round again. Everything great.
Suddenly - the next time I tried to load Ubuntu, strange white line across the screen, and then a message saying "Scanning for btrfs" with an [OK] on the right hand side, and nothing happened thereafter. I waited a long time. I've tried again with similar although not identical results. But it always just hangs. I cannot load Ubuntu.
I reckon I should repartition my Linux space with ext4 and / and /home, since I now understand btrfs may not be as stable as it was cracked up to be. But if I do this from my DVD what will happen to GRUB, which automatically installed itself from the DVD? Can I in fact do this safely? Last thing I want at this stage is not even to be able to get into Windows.
Any help gratefully received.