/etc/apt/sources.list" E212: Can't open file for writing

Question

I am trying to edit sources.list using vi editor but getting the following error while saving the file:

/etc/apt/sources.list\" E212: Can\'t open file for wr         


        

Answer 1

I referenced to Zsolt in level 2, I input:

:w !sudo tee % > /dev/null

and then in my situation, I still can't modify the file, so it prompted that add "!". so I input

:q! 

then it works