I installed the LMDE 201109 XFCE 32-bit on a spare partition, everything seemed to go well, the Mint 9 install on the other partititon still works, GRUB still works, everything seems OK.
But when I try to boot into the new LMDE install, it gets to the login screen no problem, but when I enter my password the screen goes black and then the login screen pops back up. It's not that I have the password wrong; I deliberately entered the wrong PW and I got an "authentification failed" error.
So... any ideas?
Omnia mutantur, nihil interit.