In fact, all entries in /dev/mapper are not symlinks in Ubuntu. Somehow my grub2 could not find the disk and I had to boot using a rescue cd and it created the symlinks I saw after chrooting in Ubuntu.
-- grub-probe: cannot find a device for /boot/grub https://bugs.launchpad.net/bugs/591454 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
