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I am trying to change a GRUB2 boot entry and can not seem to edit or save the file after entering sudo vi /etc/grub.d/10_lupin into terminal.

I am having the same problem as a few others with the way Ubuntu 14.04 boots and found instructions to fix the problem by changing this line:

linux   ${rel_dirname}/${basename} root=${LINUX_HOST_DEVICE} loop=${loop_file_relative} ro ${args}

to this:

linux   ${rel_dirname}/${basename} root=${LINUX_HOST_DEVICE} loop=${loop_file_relative} rw ${args}

Please be patient with me, I don't know what the heck I'm doing.

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Try using this line in the Terminal: sudo nano /etc/grub.d/10_lupin

As I'm not that familiar with using Vi to edit text, Nano was a little easier for me to edit. just press Ctrl+o to write the file Ctrl + x to exit when you're finish with it, and when you're back in the terminal, enter sudo update-grub

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