Readline не работает в rvm - Ubuntu 11.10

Я использую rvm на моем ubyntu 11.10. Моя строка чтения не работает, я попробовал ruby ​​extconf.rb , но он не прошел. Результат ниже:

$ ruby extconf.rb 
checking for tgetnum() in -lncurses... yes
checking for readline/readline.h... yes
checking for readline/history.h... yes
checking for readline() in -lreadline... no
checking for readline() in -ledit... no
checking for editline/readline.h... no

Я попытался установить libncurses5-dev и libreadline5-dev

$ sudo apt-get install libncurses5-dev libreadline5-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libreadline5-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  libreadline-gplv2-dev:i386 lib64readline-gplv2-dev:i386 libreadline-gplv2-dev

E: Package 'libreadline5-dev' has no installation candidate

В чем проблема? Кто-нибудь может помочь?