Gnome 2 is dead upstream. You would need to either install and older version of LMDE (if such a things exists) or install Debian Stable. Even on Debian Stable it would only be supported for another year after Wheezy gets released, so figure roughly another 18 months then it will be completely without support of any kind.
Have you tried using MATE?
Debian Sid KDE4.8.4 Kernel 3.4 Thinkpad R40 CPU Pentium M 1.3MHz RAM 2GB ATI Mobility 7500
Debian - "If you can't apt-get something, it isn't useful or doesn't exist"Giant Debian sources.list
| Debian upgrade script smxi
| sysinfo script inxi