Quick and dirty way is to use something like a xubuntu disk and install side by side with whatever you have there. Then, before updating or anything else put your LMDE disk in and run it using the latest extra partitions for root and swap files. It works.
Robert Collard, Madison, WI
HP s5710f, 2x AMD Athlon II firstname.lastname@example.orgGhz, 3GB RAM, 640GB HD
Debian 7.1 Wheezy 3,2,0-4 Xfce 4.10 AMD-64
LMDE 3.10.5-1 Xfce 4.10 AMD-64
SalineOS 2.0 3.2.0-4 Xfce 4.8 AMD64