rubygems 1.3.7在Ubuntu上安装期间TypeError（在'merge'中）

While installing ruby-1.9.2-p0 with rvm on an updated Ubunutu x86_64, I keep getting an error in `merge': can't convert String into Hash (TypeError). All apt packages in rvm notes and those found in the rubygems manual have been installed. I believe the error is resulting when RVM is attempting to install rubygems.While installing ruby-1.9.2-p0 with rvm on an u