--- a/ui/main.cpp	Mon Nov 24 14:43:36 2014 +0100
+++ b/ui/main.cpp	Mon Nov 24 15:48:49 2014 +0100
@@ -189,13 +189,20 @@
         app.setFont(font);
     }
 
+
+    QDateTime sigDt;
+#ifndef Q_OS_WIN
+    /* Read it from the install config. */
+    sigDt = ProcessHelp::getSigDtFromInstSettings();
+    Q_UNUSED(signed_time);
+#else
     if (signed_time != 0 && signed_time != -1) {
-        QDateTime sigTime = QDateTime::fromTime_t(signed_time);
-        QSettings settigs;
-        settings.setValue("Software/currentSigDt", sigTime);
+        /* Take it from the selftest result. */
+        sigDt = QDateTime::fromTime_t(signed_time);
     }
+#endif
 
-    MainWindow mainWin(trayMode);
+    MainWindow mainWin(trayMode, sigDt);
 
     return app.exec();
 }

--- a/ui/mainwindow.cpp	Mon Nov 24 14:43:36 2014 +0100
+++ b/ui/mainwindow.cpp	Mon Nov 24 15:48:49 2014 +0100
@@ -124,10 +124,11 @@
     return -1;
 }
 
-MainWindow::MainWindow(bool trayMode):
+MainWindow::MainWindow(bool trayMode, const QDateTime& sigDt):
     mTrayMode(trayMode),
     mManualDetailsShown(false),
-    mFailedConnections(0)
+    mFailedConnections(0),
+    mSigDt(sigDt)
 {
     createActions();
     createTrayIcon();
@@ -281,15 +282,14 @@
     bin_verify_result verifyResult = verify_binary(swFileName.toUtf8().constData(),
             swFileName.toUtf8().size());
     QDateTime sigDt = QDateTime::fromTime_t (verifyResult.sig_time);
-    QDateTime currentSigDt = mSettings.value("Software/currentSigDt").toDateTime();
 
-    if (verifyResult.result != VerifyValid || (currentSigDt.isValid() && sigDt <= currentSigDt)) {
+    if (verifyResult.result != VerifyValid || (mSigDt.isValid() && sigDt <= mSigDt)) {
         handleLTE(lteInvalidSoftware);
         if (verifyResult.result != VerifyValid) {
             qDebug() << "Failed to verify downloaded data.";
         } else {
             qDebug() << "Software update was signed at: " << sigDt;
-            qDebug() << "But the installed software was signed on: " << currentSigDt;
+            qDebug() << "But the installed software was signed on: " << mSigDt;
             if (verifyResult.fptr) {
                 fclose(verifyResult.fptr);
             }
@@ -425,15 +425,14 @@
             filePath.toUtf8().size());
 
     QDateTime sigDt = QDateTime::fromTime_t (vres.sig_time);
-    QDateTime currentSigDt = mSettings.value("Software/currentSigDt").toDateTime();
 
-    if (vres.result != VerifyValid || (currentSigDt.isValid() && sigDt <= currentSigDt)) {
+    if (vres.result != VerifyValid || (mSigDt.isValid() && sigDt <= mSigDt)) {
         handleLTE(lteInvalidSoftware);
         if (vres.result != VerifyValid) {
             qDebug() << "Failed to verify installer.";
         } else {
             qDebug() << "Software update was signed at: " << sigDt;
-            qDebug() << "But the installed software was signed on: " << currentSigDt;
+            qDebug() << "But the installed software was signed on: " << mSigDt;
             if (vres.fptr) {
                 fclose(vres.fptr);
             }

--- a/ui/mainwindow.h	Mon Nov 24 14:43:36 2014 +0100
+++ b/ui/mainwindow.h	Mon Nov 24 15:48:49 2014 +0100
@@ -23,6 +23,7 @@
 #include <QCheckBox>
 #include <QScrollArea>
 #include <QProcess>
+#include <QDateTime>
 
 #include "downloader.h"
 #include "certificatelist.h"
@@ -54,9 +55,13 @@
      * reached. If tray mode is true it also exits after
      * an update check.
      *
+     * The sigDt parameter is used to determine if a software
+     * update should be installed.
+     *
      * @param[in] trayMode set the tray mode
+     * @param[in] sigDt the datetime when the binary was signed.
      * */
-    MainWindow(bool trayMode);
+    MainWindow(bool trayMode, const QDateTime& sigDt = QDateTime());
 
     /**@brief set the current message to be shown
      *
@@ -380,6 +385,7 @@
     int mChangeCount;
     bool mManualDetailsShown;
     int mFailedConnections;
+    QDateTime mSigDt;
 };
 
 #endif // MAINWINDOW_H

--- a/ui/processhelp.h	Mon Nov 24 14:43:36 2014 +0100
+++ b/ui/processhelp.h	Mon Nov 24 15:48:49 2014 +0100
@@ -13,6 +13,7 @@
 
 #include <QList>
 #include <QString>
+#include <QDateTime>
 
 /**
  * @file processhelp.h
@@ -54,6 +55,15 @@
 * @brief Clean up internaly used infrastructure like pid/lock files.
 */
 static void cleanUp(void);
+
+#ifndef WIN32
+/**
+* @brief Read the signature timestamp from settings.
+*
+* @returns The signature timestamp as qdatetime or an invalid dt on error.
+*/
+static QDateTime getSigDtFromInstSettings();
+#endif
 };
 
 #endif // PROCESSHELP_H

--- a/ui/processhelp_linux.cpp	Mon Nov 24 14:43:36 2014 +0100
+++ b/ui/processhelp_linux.cpp	Mon Nov 24 15:48:49 2014 +0100
@@ -9,6 +9,7 @@
 
 #include "processhelp.h"
 #include "linuxlockfile.h"
+#include "util.h"
 
 #include <fcntl.h>
 #include <semaphore.h>
@@ -16,6 +17,7 @@
 #include <QDebug>
 #include <QDir>
 #include <QStandardPaths>
+#include <QApplication>
 
 int lockFileFD = -1;
 
@@ -47,4 +49,50 @@
     close_lockfile(lockFileFD);
 }
 
+QDateTime ProcessHelp::getSigDtFromInstSettings() {
+    QString pathCandidate;
+    QDateTime retval;
+    if (is_system_install()) {
+        pathCandidate = "/etc/" + qApp->applicationName() + "/" +
+          qApp->applicationName() + "-inst.cfg";
+    } else {
+        qDebug() << "Application name is : " << qApp->applicationName();
+        pathCandidate = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation) +
+          + "/" + qApp->organizationName() + "/" +  qApp->applicationName() + "-inst.cfg";
+    }
+    QFileInfo fi(pathCandidate);
+    if (!fi.isReadable()) {
+        qDebug() << "Failed to find install config: " << pathCandidate;
+        return retval;
+    }
+    QFile instcfg(pathCandidate);
+    if (!instcfg.open(QIODevice::ReadOnly)) {
+        qDebug() << "Failed to open install config";
+        return retval;
+    }
+    QByteArray data;
+    int readLines = 0;
+    while (readLines < 100) {
+        readLines++;
+        data = instcfg.readLine();
+        if (data.isEmpty()) {
+            qDebug() << "Failed to read install config";
+            break;
+        }
+        QString line = QString::fromLocal8Bit(data);
+        if (line.startsWith("SIG_DATE=")) {
+            bool ok = false;
+            QString sigDate = line.replace("SIG_DATE=","");
+            long sigSecs = sigDate.toLong(&ok);
+            if (!ok) {
+                qDebug() << "Failed to convert sig date to long";
+            }
+            retval = QDateTime::fromTime_t(sigSecs);
+            break;
+        }
+    }
+    qDebug() << "Sig time is: " << retval;
+    instcfg.close();
+    return retval;
+}
 #endif /* Not WIN32 */