/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

for me worked changing the filesystem from Read-Only before running vim:

bash-3.2# mount -o remount rw /