The LMDE 201204 Installer has grandiosely bug, it may be could manifest itself on GRUB install stage. However, this does not always manifest error. It seems connected with the strange behavior of the installer and can take it if I have presence of mounted disk(s) at the stage of installing the OS.
In the main, I get an OS that has only single entry in GRUB who indicating only that the installed OS if I take install the OS with mounted hard drive(s) and I have opened File Manager with one of the folders on the mounted disk(s)...
Of course, we can say: 'You fool himself', but userfriendly Linux distributive - just who is especially distributed on LiveCD - it's an unacceptable situation, IMHO.
Moreover, I remember: all early Linux installers asked me for unmounting the mounted disks when detects such the situation. It's normally behavior for them.
Additional information. I have two attempts to install this distros.
On first I have strange behavior of the Installer: I have all partitions on two disks are mounted; I has strange behavior on stage formatting FS and after running copying process for distro' file set on the new created partition, when presence automatically opened FM window. And I confirm other people's reporting that have been a 'beeps' on system speakers too... It's very abnormal situation, IMHO...
On second installation situation I have described above. Difference with it is are opened mine two FM windows: into one window I have the home mint folder, and into window number two I has opened with mine one folder on secondary HDD.
Note. I install the LMDE on primary HDD.