Ok, removing plymouth with apt-get purge (not by disabling splash
script) solved the issue and allowed me to boot.
** Changed in: upstart (Ubuntu)
Status: Confirmed = Fix Released
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Lucid beta 1 won' t boot, upstart scripts broken
https://bugs.launchpad.net/bugs/552046
You received
Will leave bug open as the one marked as duplicated rightly consider
this still open (i guess as beta this plymouth issue will be solved, but
it is anyway a bug as apparently many systems are not featuring it) and
since this bug being the primary one, it could hide the issue to
maintainers.
**
