You probably need to disable a merge tool. Check 'hg showconfig merge-tools' and you'll probably find something. If this is on a debian derived system, I think

You probably need to disable a merge tool. Check 'hg showconfig merge-tools' and you'll probably find something. If this is on a debian derived system, I think that package maintainer turns on a bunch of stuff by default, so you may need to find a file in /etc/hg or similar.