Comment 2 for bug 1544926

The error in your log is:

insserv: warning: script 'S99autotest' missing LSB tags and overrides
insserv: warning: script 'autotest' missing LSB tags and overrides
insserv: There is a loop at service plymouth if started
insserv: There is a loop between service plymouth and procps if started
insserv: loop involving service procps at depth 2
insserv: loop involving service udev at depth 1
insserv: Starting autotest depends on plymouth and therefore on system facility `$all' which can not be true!

This is not a bug in Ubuntu. You have an init script on your system, /etc/init.d/autotest, which is not from Ubuntu and which is not an LSB-compliant init script. This is not supported, and will cause insserv to fail to calculate boot order as shown here.