As you use a LOS ROM, you probably run into the same problem as I did. The package name conflicts sometimes with the installed camera app in the system. You need to remove it first and reboot, cleaning cache and dalvik before you can install the package.
EDIT: I tried to answer with the xda app before, but that did not work, so I tried again with the browser version.
EDIT: I tried to answer with the xda app before, but that did not work, so I tried again with the browser version.
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