Make logging more useful

- Do not log progress percent but log job names.
- Log install failures.

src/libcalamares/JobQueue.cpp

@@ -55,6 +55,7 @@ public:
         for( auto job : m_jobs )
         {
             emitProgress();
+            cLog() << "Starting job" << job->prettyName();
             connect( job.data(), &Job::progress, this, &JobThread::emitProgress );
             JobResult result = job->exec();
             if ( !result )
@@ -86,7 +87,6 @@ private:
             : tr( "Done" );
 
         qreal percent = ( m_jobIndex + jobPercent ) / qreal( jobCount );
-        cLog() << Q_FUNC_INFO << "percent=" << percent * 100 << message;
 
         QMetaObject::invokeMethod( m_queue, "progress", Qt::QueuedConnection,
             Q_ARG( qreal, percent ),

src/libcalamaresui/ViewManager.cpp

@@ -18,6 +18,7 @@
 
 #include "ViewManager.h"
 
+#include "utils/Logger.h"
 #include "viewpages/ViewStep.h"
 #include "InstallationViewStep.h"
 #include "JobQueue.h"
@@ -119,6 +120,10 @@ ViewManager::insertViewStep( int before, ViewStep* step)
 void
 ViewManager::onInstallationFailed( const QString& message, const QString& details )
 {
+    cLog() << "Installation failed:";
+    cLog() << "- message:" << message;
+    cLog() << "- details:" << details;
+
     QMessageBox msgBox;
     msgBox.setIcon( QMessageBox::Critical );
     msgBox.setWindowTitle( tr("Error") );