I just installed QT Creator 2.4.1 (Based on QT 4.8.0 64bit) from Ubuntu Software Center and noticed that it was not the latest version. How do I upgrade it from terminal? My Ubuntu is 12.0.4LTS.
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The regular ubuntu repositories don't contain the latest version of QT or QT Creator, you will first have to add an ppa via the command line:
sudo add-apt-repository ppa:ubuntu-sdk-team/ppa
Now you can update:
sudo apt-get update sudo apt-get upgrade
If this doesn't work, try removing QT Creator first and then reinstalling with:
sudo apt-get install qtcreator