/etc/apt/sources.list.d issue

[john_cullen at purencool.com]

Hi all,

I have some ppa that are getting a 404 failed to get. I don't need them 
at all but
when I update the are starting to annoy me.  I have found them in the 
file path below
sudo vim  /etc/apt/sources.list.d but I cant remove them from the file. 
It asks me to do the following

" 
============================================================================
" Netrw Directory Listing                                        (netrw 
v143)
"   /etc/apt/sources.list.d
"   Sorted by      name
"   Sort sequence: 
[\/]$,\<core\%(\.\d\+\)\=\>,\.h$,\.c$,\.cpp$,\~\=\*$,*,\.o$,\.obj$,\.info$,\.swp$,\.bak$,\~$
"   Quick Help: <F1>:help  -:go up dir  D:delete  R:rename  s:sort-by  
x:exec
" 
============================================================================


  I am not confident enough to go further without knowing what is going 
on. My question is what is going and is this the right way to get rid of
a ppa?

-- 
*purencool*
w:www.purencool.com
b: www.purencool.com/blog
t:purencool
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