initramfs - need to edit text file

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I'm stuck in initramfs on Linux Mint v15 and I need to edit /bin/grub/grub/cfg. I have the sda1 device mounted but not sure what to do to edit. I try exec ./usr/bin/vi and it throws a kernel panic.

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Now there are options to do. I followed the below path:

  1. Make a temp directory.

  2. Mount the root filesystem (/) on the temp directory.

  3. Then chroot it.

    (initramfs) mkdir /mnt

    (initramfs) mount /dev/device-name /mnt

    (initramfs) chroot /mnt

    $ vi