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Is it enough to just create a very strong password for Ubuntu login or I need to do something else? I just want to make sure they will not be able to access my files / logins etc. while repairing my screen.

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    Depending how paranoid you are, the best way is to remove the drive. No drive no access. – crip659 Oct 11 '20 at 11:08
  • @crip659 That sounds like a good answer. I had this idea myself a while back. You could remove the hard drive and provide them either a different hard drive or just give them a USB with a live installer on it and tell them to use the "try Ubuntu without installing" option. – mchid Oct 11 '20 at 16:08
  • You can test it out with an external monitor (if you have one) to see if there's any problem booting from a USB. – mchid Oct 11 '20 at 16:12
  • My computer guy destroys hard drives from computers that he gets for reselling or trashing. Data can only be hidden not erased. Money and know how can find it. – crip659 Oct 11 '20 at 17:14

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If it's your screen being repaired, consider removing the harddrive before hand. This suggestion makes three assumptions

  1. The harddrive is removable
  2. You have enough confidence to open the case - in which case you might be able to perform the screen repair your self
  3. There is another bootable drive (such as a DVD) in the unit. The repair people are going to want to boot something to verify the screen repair.