Invalid package error

I have a fairly new Nexus 4 and I have been getting this Invalid package error for some days now on random new apps I am downloading.

There is no specific behavior pattern to the issue in terms of apps, network ,cache. I scoured forums et all and saw there were solutions and it ranged from restarting the phone to wiping the phone even, but no one knew which one would solve it for sure and why. And to top it, this is NOT a new behavior apparently.

Google support took me through an endless loop of questions, answers and then the same questions again. Have you guys faced this issue? Anyone know why this is happening and is Google even fixing it? If they dont care, why is there no hue and cry over it? I mean cmon, why do we have to jump through hoops to download an app.