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

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

You just need to access to Gemfile with root access. Before vi:

command:

sudo su -

then:

vi ~/...

Or perhaps you are on a readonly mounted fs

It might be possible that the file you are accessing has a swap copy (or swap version) already there in the same directory

Hence first see whether a hidden file exists or not.

For example, see for the following type of files

.system.conf.swp

By using the command

ls -a

And then, delete it using ...

rm .system.conf.swp

Usually, I recommend to start using super user privileges using ...

sudo su

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

bash-3.2# mount -o remount rw /

Try to connect as root and then edit file. This works for me

That happens to me all the time, I open a root file for writing:

Instead of losing all your changes and re-opening with sudo. See this demo of how to save those changes:

One time Setup demo to create a root owned read only file for a lower user:

sudo touch temp.txt
sudo chown root:root temp.txt
sudo chmod 775 temp.txt
whoami
el

First open the file as normal user:

vi temp.txt

Then make some changes to the file, it warns you its read only. Use this command.

:w !chmod 777 %

Then write the file:

:wq!

The permissions are expanded, and the file is saved. You need the exclamation point because you are editing a root file as a lesser user.

Explanation of what that command does:

The :w means write the file. The bang means start interpreting as shell. chmod means change permissions, 777 means full permissions everywhere. The percent means the current file name.

It applies the change. And it ask if you want to re-load. Press "O" for "Ok". Don't reload or you'll lose your changes.

I got this error when I used git rm on a file in a directory.

I was in something like ~/gitRepo/code/newFeature

In newFeature there was only one file. I did a git rm on that file then tried to create a new file myNewFile using vi.

Ubuntu showed me as still being inside the newFeature directory but actually git rm had removed the whole directory.

I had to exit out of vi, navigate up one directory and then recreate the newFeature directory.

For me there was was quite a simple solution. I was trying to edit/create a file in a folder that didn't exist. As I was already in the folder I was trying to edit/create a file in.

i.e. pwd folder/file

and was typing

sudo vim folder/file

and rather obviously it was looking for the folder in the folder and failing to save.

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

because the dir is not exist.

can use :!mkdir -p /etc/apt/ to make the directory.

then :wq

I got this error when my directory path is incorrect, ensure your directory names and path are correct

change user to root

sodu su -

browse to etc

vi sudoers

look for root user in user priviledge section. you will get it like

root ALL=(ALL:ALL) ALL 

make same entry for your user name. if you username is 'myuser' then add

myuser ALL=(ALL:ALL) ALL

it will look like

root ALL=(ALL:ALL) ALL 

myuser ALL=(ALL:ALL) ALL 

save it. change root user to your user. now try the same where you were getting the sudoers issue

Pre-append your commands with sudo.

For example, Instead of vim textfile.txt, used sudo vim textfile.txt. This will resolve the issue.

change the permission for the other user for that type setfacl -m u:username:rw filename