Unable to install software even with enough available space When I try to update some of my applications, I get the error Unable to install *. Delete some items and try again. When I click manage applications, it shows that I have about 160 MB free space and the app I'm trying to install is under 30 MB.

Android version is 4.1.2 and my device is Samsung galaxy ace II.

(I periodically scan the phone with SD Maid to free resources, but it doesn't help this problem)
Devices reserve storage space in order to work. My tablet has 500Mb spare, but it won't let me install below 350Mb to keep it working properly.