{ask} gan saya kok gagal terus ya install modem ?

[failsystem]

gan saya barusan coba install smatfren di ubuntu ,tapi kok gagal terus ya,padahal sudah inikutin cara-cara yang ada di trit tetangga



http://ceriwis.us/showthread.php?t=5915067



tapi tetep ga bisa,,muncul pesan gini gan,,



yudhi@yudhi-Aspire-2920:~$ sudo apt-get install wvdial

Reading package lists... Done

Building dependency tree

Reading state information... Done

Package wvdial is not available, but is referred to by another package.

This may mean that the package is missing, has been obsoleted, or

is only available from another source



E: Package 'wvdial' has no installation candidat



tuh gan,baru pertama coba aja dah gagal ,suram,,apa yang salah ya gan,mohon bimbingannya,saya baru pakai ubuntu beberapa hari ini,,,

newbie banget