(In other words, this how-to is essentially obsolete, but I will leave it up just in case 
)Edit: The How-To works suberbly, in the end and the word of warning about the glitch in renaming the file is very pertinent
. Thank you viking,although the tar command you gave was backwards (shouldn't it be destination name then source), being in the terminal allowed me to see that the .desktop file was funky (MdmGreeterTheme.desktop.desktop) - I guess caja didn't catch that - it is best to rename .desktop files through the terminal. ------------------------------------------------------------------------------------------------------------------------------------------------------------------
At any rate, I read this How-To, and tried what it said, then dragged and dropped the tarball into mdmsetup under the 'Local' tab, it asks if I want to install, I hit install, but then I'm getting a goofy message:
"Not a theme archive; File not a .tar.gz or tar archive"
when I know very well it is - I had just saved it as such
. I don't know if there is a connection, but when I choose the "+Add" option directly (instead of dragging and dropping) neither files appear in the open file list, and under the file type it has only an option for "Theme Archives". Is there some sort of extension for Archive manager, or what am I doing wrong?
Thank for reading