How can I fix Malformed line (54) when gedit wont load?

Question

Malformed line (54) error message gedit not running, cannot fix as line editor will not load.

I cannot load any new software or programs.

gedit worked before when I was in dual boot but I wiped the detested windows 10, in doing so and moving partitions I had to reinstall ubuntu from thumb drive.

When I started to try to load previously running programs that is when the trouble started.

I dont know if my hand stuttered and placed an extra character somewhere?

Answer 1

1. Open a terminal.
2. Insert the command sudo nano /etc/apt/sources.list, will ask for your password.

3. Press Ctrl+_¹ and insert the number of the line: 54. Press Enter.

   Anything which doesn't fit this format is incorrect.

   # Comment, marked by a line starting with '#'
   deb http://site.example.com/debian distribution component1 component2 component3
   deb-src http://site.example.com/debian distribution component1 component2 component3
   

   The URL, distribution and components will be different. It does not necessarily have to have 3 components.

4. Correct the line, and once corrected, press Ctrl+o (saves the file) and then Ctrl+x (exits nano).

5. Run sudo apt update to check the problem has been solved.

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^{¹You may have to press Ctrl+Shift+- to get the _. I can't be sure because I use a spanish keyboard.}