no such file to load -- readline

可能是缺少两个包

sudo apt-get install libncurses5-dev
sudo apt-get install libreadline5-dev

cd .rvm/src/ruby-1.9.2-p180/ext/readline   #  反正就是在ruby的 ext/redline 目录下
ruby extconf.rb
make
sudo make install

cd /home/demon/hello


如果还是不行

rvm remove 1.9.2
rvm install 1.9.2