Connection made via sakis3g not recognised by software center

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http://askubuntu.com – I have used sakis3g to connect to internet as network manager is not able to make a connection although it recognizes the modem.But the problem is many software including pidgin and software center doesn't know that computer is already connected to internet and I am having problems installing software especially the debs I downloaded. Although I can still download and install packages from terminal. So is there any way I can make software center recognize this connection? or can I install debs in some other alternative way? (HowTos)