adding
COMPREPLY+=( $( initctl list 2>/dev/null | cut -d' ' -f1 ) )
to _services() does the trick.
submitted upstream
https://alioth.debian.org/tracker/index.php?func=detail&aid=314897&group_id=100114&atid=413095
** Bug watch added: alioth.debian.org/ #314897
http://alioth.debian.org/su
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: bash-completion (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1188897
Tit