App update/install claim insufficient storage with 3GB free on SD As you can see, the default write disk is set to the SD card with more than 3GB free, but it still complains of insufficient storage even for apps that do not exceed 100MB total size (I did not check the minimum size to trigger it, however).

What can I do to get around it?
Whenever you try to update and app, it first gets moved automatically to phone memory, even if the preferred install location is set to sd card.

Now, it is quite possible  (like in my case), the phone memory does not have sufficient storage for the app, or to hold the update along with the previous version. In that case, the apps will not get updated.

Whenever any app that was on the sd card is updated, you must again manually transfer it back to external storage, or it'll remain in phone memory