[KevinH]

You could deinstall the compiled version but no need to delete its Preferences.

The way to set an environment variable so it is kept across logouts in any unix is to edit your ~/.profile or ~/.bashrc file (depending on which your system uses) and add the following line:

export SIGIL_ALLOW_CODEVIEW_DROP=1

Your .bashrc or .profile is run once for every new login session, and it sets and exports any environment vars for all programs you run.

I am not a Ubuntu user so I have no idea whether it is your .bashrc or .profile file but it can not hurt to add it to both if both are present.