Mint 11 lxde is old, but I like it for my Asus EEE PC. It does have one annoying glitch. If you attempt to remove software such as gnumeric, the uninstall process leaves the program's icon in the menu. Annoying but not exactly critical.
There is an easy work around. Go to a convenient location and create a new folder called "deleted icons". Next open the /usr/share/applications folder. Go to tools and select "Open current folder as Root". This displays a new window. Find the offending software and select cut. Go to the deleted icons folder and again, select tools and open as "Open current folder as Root". Paste in the offending program and close all windows.
By shifting the icon via cut-paste, you retain the option of reinstalling the program.