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I am trying to install this deb package but whenever I doubleclick it the install button is disabled.

I don't have internet connection.

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Most likely you are missing dependencies and that's why software center refuses to install. – con-f-use Jul 14 '12 at 9:10
Do you have all the dependencies? – Anwar Shah Jul 14 '12 at 9:12
Do you have the package locally? Has it been downloaded? – Mitch Jul 14 '12 at 9:15
How to find out what I am missing? Software center doesn't prompt anything. @Mitch yes, I downloaded it. – lunar Jul 14 '12 at 9:18
You also need firmware-b43-installer. One big problem is that package needs an internet connection to download the Broadcom binary firmware package, so it's easiest if you can somehow get an Ethernet connection for just a few minutes. – izx Jul 14 '12 at 9:23
up vote 13 down vote accepted

Open a terminal and go to the directory where the .deb file in loacated.

Then execute

sudo dpkg -i b43-fwcutter_015-9_i386.deb

This should work.

Note: Most of the time, this should not work if you don't have all dependent packages installed. But I inspected this package, and see that, it is only dependent on libc6 package, which is automatically installed by Ubuntu. Hence it should work.

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or you can install multiple deb package by typing sudo dpkg -i *.*deb – Kaktarua Jul 14 '12 at 9:15
@Kaktarua, yes, only if you have all dependencies in the folder. – Anwar Shah Jul 14 '12 at 9:18
Thanks Anwar Shah you answer helped me to install the package. – lunar Jul 14 '12 at 9:31

I know it's a late answer, but you can install a .deb file by right-clicking on it and then selecting the Open in software center option.

This will take you to the software center from where you can install it very easily.

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You can also use GDebi if you want to install .deb packages via a GUI. I've used it to install Kernel updates before, it does a great job.

Look for GDebi in the Software Center.

Stay Awesome and Always Believe

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