I think is useful to be able to double-click .deb files and install with GDebi. Of course the Opera example shows it is entirely possible to install with dpkg and then use apt-get to resolve dependencies from Terminal, if you prefer to live without GDebi.

Nevertheless, if you want it for easeā€¦

sudo apt-get install gdebi

However, it has a few dependencies, which we have deliberately removed with previous commands, so apt started to complain.

I managed to fix it with the following:

sudo apt-get install -f

Then repeating:

sudo apt-get install gdebi
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