It happened for my in an upgrade from 14.10 to 15.04. Adding the ending
comment "### END INIT INFO
" fixed the issue.
So that this:
### BEGIN INIT INFO
# Provides: virtuoso
# Required-Start: $syslog
# Required-Stop:$syslog
# Default-Start:2 3 4 5
# Default-Stop
Worked this out with Dell support. Apparently a common problem with
Dell Precision M6500, but not sure of the reasoning. Problem was
resolved by replacing motherboard and video card (under warranty). Hope
this helps someone else with this problem!
** Changed in: xorg (Ubuntu)
Status: New
