Edit file File name : Alma-dark.xml Content :<background> <starttime> <year>2012</year> <month>06</month> <day>4</day> <hour>7</hour> <minute>00</minute> <second>00</second> </starttime> <static> <duration>10000000000.0</duration> <file> <size width="1800" height="1440">/usr/share/backgrounds/Alma-dark-1800x1440.jpg</size> <size width="2048" height="1536">/usr/share/backgrounds/Alma-dark-2048x1536.jpg</size> <size width="2560" height="1440">/usr/share/backgrounds/Alma-dark-2560x1440.jpg</size> <size width="2560" height="1600">/usr/share/backgrounds/Alma-dark-2560x1600.jpg</size> <size width="2560" height="1080">/usr/share/backgrounds/Alma-dark-2560x1080.jpg</size> <size width="3440" height="1440">/usr/share/backgrounds/Alma-dark-3440x1440.jpg</size> </file> </static> </background> Save