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https://serving.photos.photobox.com/18156716f350a12bd31b61ca638825e809e811d642dc091097fdb48b9f5fac5062a5c74a.jpg

Here is the picture of my problem. I cannot boot my laptop and cannot log on to the Ubuntu screen. I have serious problems as I have copied the wrong info on the data recovery through Test disk.

What actually happened:

  1. I used testdisk and backed up 2 files. 1 file was not important. Now the hard drive space is now completely full. I tried so many sources on Ask Ubuntu and Google, but it still doesn't help.
  2. The monitor keeps showing a black screen with "_" a flashing underscore character _. The link that I uploaded is here.

Now my screen keeps blinking: https://www.youtube.com/watch?v=BN4twl0V8JQ

karel
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LifeIsATest
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    As I've already suggested, you must unmount the partition first, but it's easier to just boot a 'live' system (such as install media) and run fsck from there (as your live [dvd or thumb-drive] will be mounted & your disk partitions unmounted allowing fsck to proceed) – guiverc Nov 28 '18 at 13:29
  • @guiverc How can I do this in a detailed step by step? I don't know how to unmount this. It is very confusing. I really appreaciate your time for your help. – LifeIsATest Nov 28 '18 at 13:36
  • If you don't know how to do it (you just execute the umount command, but the moment you do that you've lost access to the fsck command you want to execute next, so.... [long & complicated]), which is why I suggested booting a 'live' medium (such as Ubuntu install media), as it saves loads of command, plus is far less prone to error (thus safer for your data) – guiverc Nov 28 '18 at 13:42
  • I also found out when I wrote on the command promt "df -h" the /dev/sda1 is almost full which is very frustrating. Thank you again for your help – LifeIsATest Nov 28 '18 at 13:48
  • @guiverc I have excuted "umount" it still says "umount: bad usage" – LifeIsATest Nov 28 '18 at 13:49
  • You didn't tell it what to unmount - but if you do umount it; your commands are coming from that partition, so you'll lose access to commands (such as fsck, mount & more) which is why I suggested the live/install media (so commands can come from that media, instead of your unmounted hdd). I suggest again you use live media if your data is important to you, it's less risky. – guiverc Nov 28 '18 at 13:58
  • @guiverc How do I do/use the live media? or "booting live medium" I'm not very sure how to do this. – LifeIsATest Nov 28 '18 at 14:00
  • Insert your live media (eg. Ubuntu install cd/usb-thumb-drive), turn on your system & press whatever key pulls up the boot-select menu (on my current dell it's F12, on many hp's it's F9 - but laptops tend to be unique & model specific, i have one that uses an unlabeled black key, thinkpads usually use a blue key; some tell you on screen what to press though the message is brief). The key pulls up a menu asking you what to boot, you boot your cd/dvd/thumb-drive and then select 'try ubuntu'. You then use that gui to open terminal (ctrl+alt+T) & fsck , then navigate & delete the file... – guiverc Nov 28 '18 at 14:21

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