Hi,
Had to change line 128 from
"rvm package install zlib openssl >> $log_file 2>&1"
to
"rvm pkg install zlib openssl >> $log_file 2>&1"
for mine to work.
Running on Debian Squeeze.

Using your script at my Debian 6 system, I had this problem:

W: Failed to fetch http://www.backports.org/debian/dists/squeeze-backports/main/binary-i386/Packages 301 Moved Permanently [IP: 86.59.118.148 80]

That's because when adding "backports" at sources.list (line 97), the squeeze backports should be:
deb http://backports.debian.org/debian-backports squeeze-backports main contrib non-free
Obviously the "sudo apt-get -y -V -t lenny-backports" (line 99) should be "sudo apt-get -y -V -t squeeze-backports"

I've tested this change in here and it worked.
I understand that the script is called *-lenny, but at the REAME you points that it works on squeeze...
Wish it helps!

You should include an unintalls instructions.

I tried running this today, but I've gotten the following error:

=> Installing RVM the Ruby enVironment Manager http://rvm.beginrescueend.com/rvm/install/

% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 184 100 184 0 0 412 0 --:--:-- --:--:-- --:--:-- 1121
bash: line 1: html: No such file or directory
bash: line 2: syntax error near unexpected token <' 'ash: line 2:<title>301 Moved Permanently</title>

Hi there, sorry, but I'm still having issues.. It is now getting as far as "Installing packages (zlib, openssl) to configure Ruby (this will take awhile)...", but then just quits out.

After checking the log, it says "ERROR: Unrecognized command line argument: 'package' ( see: 'rvm usage' )"

I've tried to run the script at a Debian 6 today. The script stopped after execute "rvm-installer", telling that the file /root/.rvm/scripts/rvm does not exists.

I've managed to continue installation using the /usr/local/rvm/bin/rvm file!