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When I try to save something or rename a file/folder it say this error " Read-only file system" or run something as root in the terminal it say this error

sudo: unable to open /var/lib/sudo/"My User Name"/0: Read-only file system 
W: Not using locking for read only lock file /var/lib/dpkg/lock
E: Unable to write to /var/cache/apt/  
E: The package lists or status file could not be parsed or opened.

When I make a Folder the error dialog in the details with Nautilus is this:

Error creating directory: Read-only file system

I would show you I picture of it but it isn't even letting my save onto my flash drive. Please help me.

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It works for me and solve my problem, thanks a lot. – user257425 Mar 12 '14 at 9:41

when the system enters a read-only state it does so to prevent damage to the system, make sure your HDD is working properly/backup your data before doing anything
I suggest booting a live usb/dvd and opening gparted and use the check/repair featureThis is the command to enable writing sudo mount -o rw,remount /

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I can't because I need sudo access and I can't get it. "sudo: unable to open /var/lib/sudo/mathcubes/1: Read-only file system mount: cannot remount block device /dev/sda6 read-write, is write-protected " – MathCubes Apr 28 '13 at 2:44
as i said boot up a live disk and use gparted to check/repair the partition, if you don't have a disk you can use partedmagic it is under 500MB in size – GM-Script-Writer-62850 Apr 28 '13 at 3:20
How? Do I repair the partition in gparted? – MathCubes Apr 28 '13 at 19:00
But What do I do in gpared, reformat it NO! – MathCubes Apr 28 '13 at 20:14

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