Dell Optiplex 7040 Mini Tower i5-6400, 4GB, 500GB, DVD-RW, Ubuntu Linux 14.04 SP1
Specification

-Intel Core i5-6500 Processor (Quad Core, 6MB, 4T, 3.2GHz, 65W)

-4GB (1x4G) 2133MHz DDR4 Memory

-3.5 inch 500GB 7200rpm Hard Disk Drive

-Intel Integrated Graphics, Dell OptiPlex

-Ubuntu Linux 14.04 SP1

-Tray load DVD Drive (Reads and Writes to DVD/CD)

-1 Year Direct Dell Warranty