I've encountered the same problem with Mythbuntu 10.04 with all updates
installed. I recognized it because lirc sometimes started and sometimes not.
After some investigation I saw the following line in my syslog:
init: Failed to spawn rc main process: unable to open console: Input/output
error
apt-cache policy upstart
upstart:
Installiert: 0.6.5-6
Kandidat: 0.6.5-6
Versions-Tabelle:
*** 0.6.5-6 0
500 http://de.archive.ubuntu.com/ubuntu/ lucid/main Packages
100 /var/lib/dpkg/status
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Upstart not starting jobs on boot
https://bugs.launchpad.net/bugs/543506
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