/etc/at.deny is in at 3.1.14-1ubuntu1.
This file is owned by root:daemon, with mode 0o640.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | alias
backup
bin
daemon
ftp
games
gnats
guest
irc
lp
mail
man
nobody
operator
proxy
qmaild
qmaill
qmailp
qmailq
qmailr
qmails
sync
sys
www-data
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