M-RET and M-UP/DOWN not working in Emacs org-mode in console/terminal

Question

I\'m using emacs23 on Ubuntu 32-bit 10.04/10.10 with GNOME and Compiz.

Pressing M-RET in an org-mode plain list in Emacs (GUI) ins

Answer 1

In addition to the keys in my question, S-TAB, S-Left, S-Right, S-Up and S-Down were not working over ssh and PuTTY. Using certain keys on a TTY connection (ssh, screen, PuTTY) is a known issue. Alternative keys are included in org-mode as detailed here.