Comment 7 for bug 1731646

I upgraded from 17.04 to 17.10 just yesterday and I was affected from the same issue.

I'm sorry to say, @mitya57, you intentionally broke the qDebug _default_ behaviour (and Fedora as well).
qDebug()'ing something should result in printing in the console output.

If there's issues with some applications that result in too much verbose output, should be fixed in those applications, not shutting up the whole QT qDebug.

Anyway, this should be warned to the user in some way during the upgrade.

just my 2 cents.