I'm trying to install an apk file on my device, and I'm able to press the Install button, but after a few seconds, I keep receiving this error:

App not installed.

What is the root cause of this issue and how can I fix it?

I know this StackOverflow question is related, but that question deals more with the development aspect than the consumer installation aspect of the error.


1 Answer 1


I figured it out myself. The issue was that I had another version of the same application I was trying to install already on my device. After deleting it, the installation worked fine.

  • I had the same problem. To give more details: I was able to figure this out via adb logcat on the computer: the message was "PackageManager: Package com.zulipmobile signatures do not match previously installed version; ignoring!". Specifically, I had installed the application (Zulip) from F-Droid, and what I was trying to install was the APK released from github. It's a pity that the message shown on Android is just "App not installed" without any other explanation...
    – a3nm
    Commented Nov 18, 2023 at 21:08

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