solved his problem this way:
www.utheguru.com/solution-ubuntu-linux-binsh-cant-access-tty-job-control-\
mode-off-error

I am not sure if his problem was the same as yours or if the one that you
checked on the forums is the same. Most people are trying to load the LiveCd
when they get this error.

I am not sure what you did to bring this on. Perhaps you could backtrack and
think of something that occurred prior to seeing the error. For example, did you
press ctrl+alt+F7/F8 to initiate another session and not logout properly? Just
wondering.