I have uninstalled an app from Finder->Applications. But in launchpad, icon of the app still exists. How to remove it?
I've tried to restart Mac, no luck.
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You may need to force launchpad to rebuild it's databases. In the Terminal run
rm ~/Library/Application\ Support/Dock/*.db; defaults write com.apple.dock ResetLaunchPad -bool true; killall Dock;
NOTE: this method will re-arrange all of your launchpad icons. – Martin Zhai
Reinstall it and delete it again.
Much easier solution: you have to "long-click", just click and keep it pressed in launchpad. The buttons start to wiggle, the interface is copied from iOS.