whilst trying to edit sudoers (sudo visudo) i get the error given below. google search provides no clear explanation or fix.
E325: ATTENTION
Found a swap file by the name "/etc/.sudoers.tmp.swp"
owned by: root dated: Mon Sep 5 22:20:21 2016
file name: /etc/sudoers.tmp
modified: YES
user name: root host name: asus
process ID: 17293
While opening file "/etc/sudoers.tmp"
dated: Thu Jan 19 10:51:46 2017
NEWER than swap file!
(1) Another program may be editing the same file. If this is the case,
be careful not to end up with two different instances of the same
file when making changes. Quit, or continue with caution.
(2) An edit session for this file crashed.
If this is the case, use ":recover" or "vim -r /etc/sudoers.tmp"
to recover the changes (see ":help recovery").
If you did this already, delete the swap file "/etc/.sudoers.tmp.swp"
to avoid this message.
Swap file "/etc/.sudoers.tmp.swp" already exists!
[O]pen Read-Only, (E)dit anyway, (R)ecover, (D)elete it, (Q)uit, (A)bort: