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