We can confirm this with Natty 11.04 amd64 final on /ext4. The installation stops with failure to install Grub to /sda. The installer textbox choices e.g. install to /sdb or cancel the installation had no effect. After a reboot we performed a reinstall with Grub manually set to /sdb without issues.
** Changed in: ubiquity (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/686859 Title: "Bootloader install failed" cannot be closed -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs