Fixing/Solved "Unable to parse package file " after apt

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Problem: 

   We get an error after executing any apt command in linux 

Solution 

   The solution is very easy, I spent so many hours fixing it. 

   You just have to delete the file mentioned in the error, in my case I got: "E: Unable to parse package file /var/lib/apt/extended_states (1)" 

   I just deleted the file /var/lib/apt/extended_states 

 Example: 

   #sudo rm /var/lib/apt/extended_states 

 That's it