Comment 9 for bug 975333

Ok. After a few tries, I restored Windows 7 boot through "bootsect", erased all linux partitions... Run chkdsk... Then I used an old Ubuntu 11.04 DVD to install and create new partitions.
My favorite scheme are: 1GB /boot primary partition, a extended partition for everything else and a "swap" partition with the size of the memory available. It worked well.
After all that, I put the Ubuntu 12.04 DVD and used an update without total erase of personal data and programs in ubuntu 11.04. It installed and worked.
Finally, I did a DVD install with update. But this time a choose a fresh install. No partioning change since the 11.04 install.
It worked fine.
I assumed then it was a partitioning problem, but I don't know what caused it.
Dual boot is working normal.