Wishlist: Uninstallable applications should be made more obvious
Binary package hint: gnome-app-install
Packages that aren't available for a specific architecture are shown in the "Add/Remove Applications" list just like any other application. The only way to find out why some applications don't react when you click on them is by reading the complete description for the package.
For example, Opera can't be installed on AMD64, but the only way of knowing that is to read the complete description:
"Canonical Ltd. provides technical support and security updates for Opera
The use, modification and distribution of Opera is restricted by copyright or by legal terms in some countries.
Opera cannot be installed on your computer type (amd64). Either the application requires special hardware features or the vendor decided to not support your computer type."
In the list of applications, the text for packages that cannot be installed on a particular architecture should be greyed out. The tick box should also be greyed out, and clicking on it should open a popup box that contains the same text as the last paragraph in the above description, i.e. "<Application> cannot be installed on your computer type (<architecture>). Either the application requires special hardware features or the vendor decided to not support your computer type.".
- Andrew Sayers