* Problem: you are running Ubuntu 64 bit, and the software package you want to install is 32 bit.
Gdebi-gtk will give you the following error message:
Error: Wrong architecture ‘i386’
* Solution: install the package from the command line with the –force-architecture option:
sudo dpkg -i –force-architecture NameOfPackage.deb
For example:
sudo dpkg -i –force-architecture skype-debian_2.0.0.72-1_i386.deb