Hello, so il get right to the point I cant update any of the google apps. When trying to update Google music app, it gives me the "package file was not signed correctly.Uninstall the previous Copy if the app and try again." now, this problem also accurs with other google apps sutch as maps, calendar etc. deleting the cache and then trying to update the app doesnt work either. i also use google Keep alot.i installed the app and it says. "This app won't run unless you update Google Play Services." Ok, fine so i try to update Play services and Behold, the same error occurs,giving me the annoying "package file was not signed correctly.Uninstall the previous Copy if the app and try again." Error yet again. i tried manually downloading the android play store apk. and installing a new version, but then it gives me this error "An existing package by the same name with a conflicting signature is already installed". Deleting the cache and disabling the app and THEN trying to install it wont work either. Im using Nexus 4 with 4.2.1 I haven't rooted it, no roms. And the best part!I got this phone 2 months ago, then the problem occured, then i gave it back to the provider (thanks to the warranty), i got it back today and the problem still occurs.What they did, was "reinstalled android on the phone". So please, anyone, im about to drop the phone in the toilet if this problem does not get fixed. I wont risk on "installing a custom rom" on the phone, i almost bricked my last LG GT540 Optimus.