If you're willing to take a big chance with the source-build from the Mozilla sources, you can try that, but Firefox 1.5 won't show up in the Ubuntu repositories until about a week after the final release.
If you're running non-x86 (like me), you pretty much have no choice but to wait (if you want to do some testing, you would need to setup a chroot environment or UML virtual machine, since there are too many library conflicts to be really safe with a source build).

If you do try a source build, I strongly advise using checkinstall or something similar, so you can back it out if it totally breaks your system.

==Joseph++

Dragos Neagu wrote:
> On 10/12/05, Joseph Sinclair <plug-discuss@stcaz.net> wrote:
> 
>>If you want to install the current Firefox on Ubuntu, it's best to  just enable "Universe" in Synaptic, and install Firefox from there.
> 
> 
> Is there a way to install the beta version in Ubuntu? (1.5b2)
> 
> --
> -Dragos Neagu <><
> "If I have been able to see farther, it was only because I stood on
> the shoulders of giants." - Sir Isaac Newton
> "Open source is like science, closed source is like witchcraft" - Linus Torvalds
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