Hello,
I think you need to provide more information in order for anybody to help you.
The information you are providing is way too general.
You could maybe tell the people, what you did before or what you wanted to do (i.e. an upgrade) before you had this problem.
What Linux version, distribution, bootloader, etc.
Help us in the forum to understand more about your problem, and then we will be able to help you.
Greetings.
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