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why there is an error in installation when we download apps from unknown sources in lollipop 5.1? It was installing a few days ago but now it is showing 'app not installed' whenever I install games from non market sites

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    Unfortunately, it's unclear/too broad. Without any more information, there are many reasons why it's showing "app not installed". Try installing the APK using ADB to get clearer error message. (how-to) – Andrew T. May 14 '15 at 2:27
  • Whenever I install a game say asphalt 8 it says 'app not installed' – Wahengbam Lenin May 14 '15 at 2:51
  • Same problem happens to me each time I try installing an app from an unknown source – Silvia H Sep 14 '15 at 16:54

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