Yes the comments above give you a workable way to recover your system. You need to be able load a live linux operating system that can write your your filesystem.
I used a live-usb drive. You can use the ubuntu install cd for this purpose. After booting into the live cd based environment, you need to mount the partition on your main system that contains /boot. Then you can make the necessary modifications to grubenv as per comments above. cd /boot/grub rm grubenv grub-editenv grubenv create grub-editenv grubenv set default=0 grub-editenv grubenv list default=0 This should give a bootable system. I assume this problem is related to the instabilities in ext4? -- invalid: environment block https://bugs.launchpad.net/bugs/439784 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
