Possible Emacs doesn't start with the right PATH variable. I always start it from the terminal, but from the GNOME menu shortcut, it's just, blank. To check this is indeed the cause, check out:
M-: (getenv "PATH") If it's different to your echo $PATH in your shell then it's probably that. I think this is because Emacs is not started from the shell. So you need to add .cabal/bin and your GHC path to your session-wide (or system-wide) environment variable file: https://help.ubuntu.com/community/EnvironmentVariables#Session-wide_environment_variables Or you can make a bash script to run Emacs and change your Emacs launching shortcut to run that instead.
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