魅族系统安装包有冲突，请尝试重新安装Installation failed with message INSTALL_FAILED_USER_RESTRICTED.

Installation failed with message INSTALL_FAILED_USER_RESTRICTED.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.

WARNING: Uninstalling will remove the application data!

Do you want to uninstall the existing application?

安装包有冲突，请尝试重新安装。注意主要针对调试，或者安装过该软件再次安装无法正常安装的用户。

解决办法：找到设置--安全--访客模式（第一次没设置秘密叫隐私模式）

开启访客模式

清除访客数据

如果是android studio安装遇到此错误，而且弹框了你没处理，可以这样解决。魅族自带了手机管家，如图允许应用即可：