I want to update qt 5.4.1 to Qt 5.5 or 5.4.2 because I want to test KDE Plasma on WayLand.
Note: Please provide solution that consume least network resources as I have limited bandwidth. KUbuntu 15.04
As mentioned in other answers, this is not really recommended and may cause issues, however, if you really want it, go HERE and download the .run installer or
chmod +x qt-unified-linux-x64-online.run
This will start the
qt 5x installer.
Short: not ready yet.
General information is on this page: https://wiki.ubuntu.com/Touch/QtTesting
Answer is totally based on my experience,and the same reason why I'm here,Searching for this same answer. Well now I have figured it out for me.
Just visit the link and download the offline installer for your machine and go through the simple click steps.I'm using ubuntu 14.04 and it worked for me pretty fine.