Cannot disable com.motorola.ccc.ota Since "Motorola Software Update" decided to download Nougat OTA without asking my opinion, I declared a war. But the weapons I use are broken.

Withot su:

shell@athene:/ $ pm disable com.motorola.ccc.ota
Error: java.lang.SecurityException: Permission Denial: attempt to 
change component state from pid=22598, uid=2000, package uid=10009


With su:

1|shell@athene:/ $ su
root@athene:/ # pm disble com.motorola.ccc.ota
Error: Could not access the Package Manager.  Is the system running?


How can I disable this app?

I wouldn't like to rm the app entirely (if possible), have everything system-less so far. If relevant, I am using Moto G4 with Marshmallow.
To stop OTA updates (and notifications) on Moto devices, you don't use Package Manager, you will need to "freeze" the service...

Google Play Store has many apps that will allow you to 'freeze' the OTA Update service. Titanium Backup is a common example.

Alternatively, with a 'root access' file explorer, you can delete or rename the following files:  

/system/etc/security/otacerts.zip
/system/priv-app/3c_ota/3c_ota.apk  

These additional files can be removed or renamed: (If you still get an OTA Update notification)  

/system/priv-app/3c_checkin/3c_checkin.apk
/system/priv-app/3c_devicemanagement/3c_devicemanagement.apk
/system/priv-app/3c_notification/3c_notification.apk  

Reference