I'm dual-booting Linux 9.10 and Windows 7 using Grub. For my sins, I'm a developer so do the whole 12.0.0.1 thing - with local web-based image manipulation, accounts/stock-tracking and client-sites... and am (alas) reliant on windows for the giga-tonnage of software needed to do decent video-editing.
So. It takes me about a week to set up a new machine, a large part of which seems to involve copying and pasting things I don't really understand into CLI boxes... until something works - which leaves me with what feels like a delicately balanced card-castle, that's taken about a week to build.
So I ain't going to do anything so traumatic as upgrade my entire operating system. That happens when I get a new machine, or something absolutely catastrophic happens to the current one.
Ah, well, you've made your own bed there by running old software. There's not much we can do for you with respect to running 0.3.23 or anything current or future, and my previous advice still stands. (It's not nearly that disruptive.)