diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 158b235a6..789523cf9 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -34,7 +34,7 @@ jobs:
       ubuntu18:
         image: symless/ubuntu-sudo:18.04
       ubuntu19:
-        image: symless/ubuntu-sudo:19.04
+        image: symless/ubuntu-sudo:19.10
 
   container: $[ variables['image'] ]
 
diff --git a/src/gui/src/MainWindow.cpp b/src/gui/src/MainWindow.cpp
index 2a2eb3a2c..3c687e4e9 100644
--- a/src/gui/src/MainWindow.cpp
+++ b/src/gui/src/MainWindow.cpp
@@ -460,7 +460,7 @@ void MainWindow::appendLogRaw(const QString& text)
                 continue;
             }
 
-            m_pLogOutput->append(line);
+            m_pLogOutput->appendPlainText(line);
             updateFromLogLine(line);
         }
     }
diff --git a/src/gui/src/MainWindowBase.ui b/src/gui/src/MainWindowBase.ui
index ca2169d86..4da91c53d 100644
--- a/src/gui/src/MainWindowBase.ui
+++ b/src/gui/src/MainWindowBase.ui
@@ -439,7 +439,7 @@
       </property>
       <layout class="QVBoxLayout" name="verticalLayout">
        <item>
-        <widget class="QTextEdit" name="m_pLogOutput">
+        <widget class="QPlainTextEdit" name="m_pLogOutput">
          <property name="sizePolicy">
           <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
            <horstretch>0</horstretch>
@@ -458,11 +458,14 @@
           <bool>false</bool>
          </property>
          <property name="lineWrapMode">
-          <enum>QTextEdit::NoWrap</enum>
+          <enum>QPlainTextEdit::NoWrap</enum>
          </property>
          <property name="readOnly">
           <bool>true</bool>
          </property>
+         <property name="maximumBlockCount">
+          <number>10000</number>
+         </property>
         </widget>
        </item>
       </layout>