In Bash it is possible to set a feature that runs when a command runs called precmd to an ANSI sequence that sets a non-blinking block cursor. This make Bash usable.
However, that fails if there is no Bash or you not have your .bashrc. There are shell-like entitities that are needed to fix booting. Also, Emacs still blinks! It seems to be either the Linux console or the Emacs C code. Elisp lets you control blinking if you are running Emacs in an terminal under X or as GUI uner X, but not if you are running Emacs in the Linux console. So if you need Emacs to fix a booting problem, you can't use it if you have problems with blinking. Finally, an off-topic comment that white and blue are too bright at night for me, and that the debconf blue and grey have the same problem (the red is OK). Not all can physically adjust their monitors. What would be good is the ability to adjust the console text color to amber, and debconf to a contrasty amber theme, and brightness.
