My Ubuntu System(18.04 LTS) is just showing me like 'No Operating System Found' or 'Read Error' or Grub Error 'Unknown Error'. And also after I shutdown or switch on my system, some text is shown like command-line commands. I also tried typing ls but it didn't work and showed me an empty line in grub rescue mode. Also, it comes and then goes after some time. So please help me.
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