Public bug reported:
upstart does not even allow a sulogin or reboot to work if '/bin/sh' is
missing.
Ideally upstart should have a list of other known likely interactive
shells on the system and at least give the user a chance to untangle
their system.
** Affects: upstart (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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upstart utterly fails when /bin/sh symlink disappears
https://launchpad.net/bugs/65024
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