You tried to install grub to /dev/sda1, which is your windows partition, and this is not possible. You need to install grub to /dev/sda instead.
** Changed in: grub-installer (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1443756 Title: Elección de unidad de instalación, formateo, creacion del archivo grub, creación del archivo raiz, eleccion del archivo raiz o particion raiz. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1443756/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs