*** This bug is a duplicate of bug 1053317 *** https://bugs.launchpad.net/bugs/1053317
This bug affect also me, I had a similar disk partition with dual boot and after installing Ubuntu 12.10 I had no issue in executing Ubuntu, but I was completely unable to start my Win7 system. I though was an error on MBR an I have taken this opportunity to format the disk completely, so I have reinstalled again Ubuntu making a new partition table: 1 Primary ext4 with mount point / 1 Primary ext4 with mount point /home 1 Extended with logical Swap 1 Extended FAT32 (with HP tools on my HP dv6 laptop) At the end of installation process I had the "can't install in /dev/sda" error message, and rebooting the system, grub was unable to find the boot disk. I tried different times also changing the home partition with and Extended ext4, but with the same result. I have also tried with the Ubuntu Boot-Repair tool and other guides on the web to recover grub installation, but without success. Now I have installed Ubuntu 12.04 without any issue. Hope this will help to solve the problem. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1053750 Title: grub "can't install in /dev/sda" - 12.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1053750/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs