I have a sony xperia m mobile and uninstalled a few apps but decided to put a couple back on and it is stuck in installing mode and wont let me install the app again.
Make sure you have a good data connection. Also, if they are apps from play store, try rebooting phone to make sure uninstall was completed. Then, try downloading one at a time, or only a few at once. When I try to update apps in bulk, it sits forever. I need to force stop them and try again...