Today I had the good fortune to talk with Susyn Stenvaag, a wonderful lady--and she mentioned that she had LL's client working, with streaming audio, on 64-bit Ubuntu Linux. She pointed me at a thread in the Second Life forums, "Getting Second Life to run on Ubuntu 12.04 LTS 64 bit". There you will find the following instructions, which she also gave me, namely to run the following commands from a terminal window:
sudo apt-get install ia32-libs-multiarchIf you have the urge, you can do just one command, namely
sudo apt-get install i386 lib32gcc1
sudo apt-get install libc6-i386
sudo apt-get install ia32-libs-multiarch i386 lib32gcc1 libc6-i386In any case, you will have to have sudo capabilities and enter your password when asked for it at the first (and only, if you choose to do it all at once) command. It will download and install a bunch of files...
...and then you can run the 32-bit client and hear streaming audio!
I would go add a comment to the JIRA entry that asks for a 64-bit client, but it doesn't provide me that option.
In any case, many thanks to ever-gracious Susyn, and to Mark Lock, who posted the commands in the SL forum thread. If. for whatever reason, you prefer to run LL's client rather than a third-party SL viewer, you can now do so on 64-bit Linux without cutting yourself off from the world of SL music.