/etc/apt/sources.list” E212: Can’t open file for writing

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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 writing

Solution

Vim has a builtin help system. Running :h E212 inside Vim prints the following:

For some reason the file you are writing to cannot be created or overwritten.
The reason could be that you do not have permission to write in the directory
or the file name is not valid.

You might want to edit the file as a superuser with sudo vim FILE. Or if you don’t want to leave your existing vim session (and now have proper sudo rights), you can run:

:w !sudo tee % > /dev/null

Which will save the file.

Source: StackOverflow.com

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