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I need root access to install a file, but I seem to have forgotten my pw. To change it, it appears I will need to enter GRUB and remount / as read/write as suggested here.

I just want to know if I will need to back up my computer before doing this.

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No you don't need to. But of course you should make backups from time to time.

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Thank you for the quick response! – Paul Oct 10 '13 at 17:18

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