I am new to programming, Debian and emacs.
I tried to install packages of smex on emacs and I downloaded it from smex@marmalade but when I do the install step, emacs told me there is no match for "package-install".
Then I thought I should upgrade my emacs23 to 24 but I can not upgrade to emacs24 by
sudo aptitude upgrade
and I also do not understand other ways to install smex without using "package-install".
Could anyone help?