/etc/news/newsfeeds is in inn 1:1.7.2q-44.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##  newsfeeds - determine where Usenet articles get sent
##  Format:
##	site[/exclude,exclude...]\
##		:pattern,pattern...[/distrib,distrib...]\
##		:flag,flag...\
##		:param
##  Summary of flags:
##	<size		Article must be less then size bytes.
##	Aitems		Article checks -- d (must have Distribution header)
##			p (don't check for site in Path header).
##	Bhigh/low	Internal buffer size before writing to output.
##	H[count]	Article must have less then count hops; default is 1.
##	Isize		Internal buffer size (if a file feed)
##	Nm		Only moderated groups that match the patterns.
##	Nu		Only unmoderated groups that match the patterns.
##	Ssize		Start spooling if more than size bytes get queued.
##	Ttype		Feed types -- f (file) m (funnel; param names the
##			real entry) p (pipe to program) c (send to stdin
##			channel of param's sub-process); x (like c, but
##			handles commands on stdin).
##	Witems		What to write -- b (article bytesize) f (full path)
##			g (first newsgroup) m (Message-ID) n (relative
##			path) s (site that fed article) t (time received)
##			* (names of funnel feed-in's or all sites that get
##			the article) N (Newsgroups header) D (Distribution
##			header) H (all headers) O (overview data) R
##			(replication data).
##  Param field depends on T flag.  For Tf, relative paths are from the
##  out.going directory.  For Tp and Tc, it is a shell command to execute.
##  If a Tm refers to this entry (which will have its own T param) then "*"
##  is expanded to all the funnel sites that triggered this one.  Useful
##  for spawning one mail process, e.g.
##
##  This file is complicated -- see newsfeeds.5!
##  This is the local site.
##  The "pattern" field gives the intial subscription list for
##  all other sites.  You might want to put "!control,!junk,!<local>.*"
##  there.  The "distrib" subfield limits incoming articles.
##
##  You can also have ME/bad.site: to refuse articles from a particular
##  site (by matching the Path: entry).  Other pseudo-sites may be put
##  in here, to REFUSE certain types of 3rd-party cancel messages
##  (See the "Cancel FAQ" news.admin.net-abuse.misc):
##      cyberspam       Spam cancels, munged articles, binary postings
##      spewcancel      just munged articles from runaway gateways
##      bincancel       just binary postings to non-binaries groups
##
##  Note that refusing articles means you won't offer them to sites you feed
##
ME:*,!control,!junk,!local.*/!local::
overview:*,!control.cancel:Tc,WO:/usr/lib/news/bin/overchan
## The most often used type entries: uncomment and adjust.
# Feed all local non-internal postings to news.myprovider.com; sent off-line
# via nntpsend, send-nntp, or send-uucp.pl. Also, enable the entry in the
# crontab file to regulary actually send all batched articles.
#
# If you're not low on memory use innfeed.
#
#news.myprovider.com\
#	:*,!junk/!local\
#	:Tf,Wnm:news.myprovider.com
# An innfeed example. First, define several peers like this
# (the primary name needs to be the hostname of the peer).
#
#news.uu.net/uunet\
#	:*/!local\
#	:Tm:innfeed!
#
# Then define one "master" entry that connects to all the peers:
#innfeed!:!*:Tc,Wnm*:/usr/sbin/innfeed -y
## Create the links for cross posted articles
#crosspost:*:Tc,Ap,WR:/usr/lib/news/bin/crosspost
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