When I try to start qtchooser i get this notification:
qtchooser: could not exec '/usr/lib/x86_64-linux-gnu/qt5/bin/qtchooser': No such file or directory
I've installed Qt5 from ppa:canonical-qt5-edgers/qt5-beta-proper I hope you can help me.
The error message is normal, although uninformative. In essence you're trying to execute
Upstream has fixed the problem with a more helpful text nowadays, but that version of qtchooser is not yet in Ubuntu.