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after I pasted these lines in terminal:

sudo add-apt-repository ppa:canonical-qt5-edgers/qt5-beta1 && sudo apt-get update && sudo apt-get install qt5-meta-full && echo 'export PATH=/opt/qt5/bin:$PATH' >> ~/.bashrc

It asks for my sudo password. I do not know what to do next.

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Well, type your user password. It will not show you the password when you are typing for security reasons but after you finish typing the password and press ENTER the whole terminal line should work.

The user password is the password you use to login to Ubuntu and the one that it was set up when Ubuntu was installed.

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