insufficient storage even with marshmallow sd card formatted for internal space and plenty of space When I try to install an app from the Play Store I am getting the "insufficient storage" message but I have 20 GB free on my SD card that is formatted for internal storage. I am using a Moto G 2nd generation. Why can't I install new apps?
I have the same phone &amp; same SD card setup. David Coleman has good advice, but here are some additional points. 


Many apps will not even show the word "Change." That means they cannot be moved to the SD card. Keep looking for ones that do have that word showing. 
At least on my phone, every time I tapped on "Change" it came back with an error message. Ignore that &amp; try it a 2nd time, right away. Nearly every app I tried to move to the SD card "failed" the 1st time, but succeeded the 2nd time. 
Clearing cache can also give back some space. 3rd party apps like App Cache Cleaner don't work with Marshmallow, but clear caches one by one, or clear them all by getting to "Internal storage" again &amp; then choosing "Cached data." 
Apps like AppMgr III do not fully automate the move/change to SD card process, but they do semi-automate it. This is important because I've discovered that every time an app updates, if the older version of the app was on the SD card, the updated version still goes to internal storage!! Very frustrating. I believe I noticed this happening with Lollipop, too. It means we can't assume "once moved, always moved." AppMgr III or such can reduce the frustration.