Yup. It just doesn't work. I had similar problems a couple of years ago, and was told that 'linux users are rarer than hen's teeth' (I liked that line). Other side effects are that anything that's licensed via sketchucation is, well, not licensed.
I get around it by running SU in a windows VM, and have always meant to investigate and debug the ruby... but I've not done that yet. Perhaps someday...
Oh, there are also some extensions that are reliant on the browser that won't work. One that comes to mind is cutlist. Oh, and souvenir crashes pretty hard on certain ops.