Edit GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub - works in Ubuntu certainly, but not Mint 12.
Remove all of the plymouth-theme-* packages from your system,including the text ones. Replaces the boot splash with a flashing cursor, nothing else.
plymouth-set-default-theme - This command no longer exists, it used to work in LMDE, maybe it still does, but not Mint12.
Install plymouth-manager. All it seems to do is substitute one useless boot image for another - waste of space.
update-alternatives --config default.plymouth - told me I had no alternatives - seems like it is right
Install various 'text' based themes. - On its own does nothing except clutter up your hard disk.
Install 'galternatives'. Has no help files, but you can probably work out how to use it (copy your text theme into your default theme folder) but it makes no difference, all you get is a flashing cursor.
Google it - Yeah right! Go on and try. All you will get is people complaining about the problem, you will not get any answers that work.
I have probably missed a few out that I tried hours ago and have forgotten about, but I think you get the idea, I cannot do it which probably means either it can't be done or I have missed something glaringly obvious, but I don't think so this time. If this is some new 'feature' of Mint 12 then I hope it is not one that they will incorporate into any other version of MInt, and certainly not into LMDE which is my main mint distro.










