I cannot install startup manager

[forsubhi]

I cannot install start up manager from software center from virtual machine that has ubuntu on it .

see picture
http://img7.imagebanana.com/img/hkw9k0oc/Selection_061.png

[jerrrys]

key is missing

http://www.googlubuntu.com/results/?cx=006238239194895611142:u-ocqbntw_o&q=requires+installation+of+untrusted+packages&sa=Search&cof=FORID:9