Comment 1 for bug 554898

I believe this might be fixed in 5.9, which is not released yet though - from looking at the changelog there appear to be many ocaml fixes.

You may want to try ctags from my PPA, and if it fixes your problem provide feedback on bug 732860, which is about getting the upstream snapshot into Natty.

My PPA is at https://launchpad.net/~blueyed/+archive/ppa/+packages and you should be able to install the version I have uploaded for Lucid:

https://launchpad.net/~blueyed/+archive/ppa/+sourcepub/1546567/+listing-archive-extra