diff --git a/Telegram/Resources/qrc/linux.qrc b/Telegram/Resources/qrc/linux.qrc
index 164e8d4f2..12319be14 100644
--- a/Telegram/Resources/qrc/linux.qrc
+++ b/Telegram/Resources/qrc/linux.qrc
@@ -1,6 +1,5 @@
 <RCC>
   <qresource prefix="/qt">
-    <file alias="etc/qt.conf">../etc/qt_linux.conf</file>
   </qresource>
   <qresource prefix="/fc">
     <file alias="fc-custom.conf">../fc-custom.conf</file>
diff --git a/Telegram/SourceFiles/core/launcher.cpp b/Telegram/SourceFiles/core/launcher.cpp
index 3ba28309b..e280c44fa 100644
--- a/Telegram/SourceFiles/core/launcher.cpp
+++ b/Telegram/SourceFiles/core/launcher.cpp
@@ -272,6 +272,19 @@ int Launcher::exec() {
 	Logs::start(this); // must be started before Platform is started
 	Platform::start(); // must be started before Sandbox is created
 
+	// I don't know why path is not in QT_PLUGIN_PATH by default
+	QCoreApplication::addLibraryPath("/usr/lib64/qt5/plugins");
+	// without this Telegram doesn't start on Ubuntu 17.04 due to GTK errors
+	setenv("QT_STYLE_OVERRIDE", "qwerty", false);
+	// Telegram doesn't start when extraordinary theme is set, see launchpad.net/bugs/1680943
+	unsetenv("QT_QPA_PLATFORMTHEME");
+
+   // unset QT screen scale related envvars
+	unsetenv("QT_SCREEN_SCALE_FACTORS");
+	unsetenv("QT_AUTO_SCREEN_SCALE_FACTOR");
+	unsetenv("QT_SCALE_FACTOR");
+	unsetenv("QT_DEVICE_PIXEL_RATIO");
+
 	auto result = executeApplication();
 
 	DEBUG_LOG(("Telegram finished, result: %1").arg(result));
diff --git a/Telegram/SourceFiles/qt_static_plugins.cpp b/Telegram/SourceFiles/qt_static_plugins.cpp
index a757d085f..122ff0f5d 100644
--- a/Telegram/SourceFiles/qt_static_plugins.cpp
+++ b/Telegram/SourceFiles/qt_static_plugins.cpp
@@ -15,14 +15,4 @@ Q_IMPORT_PLUGIN(QWebpPlugin)
 Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin)
 Q_IMPORT_PLUGIN(QGenericEnginePlugin)
 #elif defined Q_OS_LINUX // Q_OS_WIN | Q_OS_MAC
-Q_IMPORT_PLUGIN(QWebpPlugin)
-Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)
-Q_IMPORT_PLUGIN(QConnmanEnginePlugin)
-Q_IMPORT_PLUGIN(QGenericEnginePlugin)
-Q_IMPORT_PLUGIN(QNetworkManagerEnginePlugin)
-Q_IMPORT_PLUGIN(QComposePlatformInputContextPlugin)
-Q_IMPORT_PLUGIN(QIbusPlatformInputContextPlugin)
-Q_IMPORT_PLUGIN(QFcitxPlatformInputContextPlugin)
-Q_IMPORT_PLUGIN(QHimePlatformInputContextPlugin)
-Q_IMPORT_PLUGIN(NimfInputContextPlugin)
 #endif // Q_OS_WIN | Q_OS_MAC | Q_OS_LINUX
diff --git a/Telegram/SourceFiles/ui/text/text.cpp b/Telegram/SourceFiles/ui/text/text.cpp
index 7891995be..eaeb52b35 100644
--- a/Telegram/SourceFiles/ui/text/text.cpp
+++ b/Telegram/SourceFiles/ui/text/text.cpp
@@ -1968,11 +1968,11 @@ private:
 		if (item == -1)
 			return;
 
-#ifdef OS_MAC_OLD
+#if defined(OS_MAC_OLD) || QT_VERSION < QT_VERSION_CHECK(5, 6, 0)
 		auto end = _e->findItem(line.from + line.length - 1);
-#else // OS_MAC_OLD
+#else
 		auto end = _e->findItem(line.from + line.length - 1, item);
-#endif // OS_MAC_OLD
+#endif
 
 		auto blockIndex = _lineStartBlock;
 		auto currentBlock = _t->_blocks[blockIndex].get();
diff --git a/Telegram/SourceFiles/ui/text/text_block.cpp b/Telegram/SourceFiles/ui/text/text_block.cpp
index 29173c5c2..b47a53d76 100644
--- a/Telegram/SourceFiles/ui/text/text_block.cpp
+++ b/Telegram/SourceFiles/ui/text/text_block.cpp
@@ -334,6 +334,9 @@ TextBlock::TextBlock(const style::font &font, const QString &str, QFixed minResi
 
 		QStackTextEngine engine(part, blockFont->f);
 		BlockParser parser(&engine, this, minResizeWidth, _from, part);
+		QTextLayout layout(part, blockFont->f);
+		layout.beginLayout();
+		layout.createLine();
 	}
 }
 
diff --git a/Telegram/gyp/PrecompiledHeader.cmake b/Telegram/gyp/PrecompiledHeader.cmake
index dfe1193be..0b13fc098 100644
--- a/Telegram/gyp/PrecompiledHeader.cmake
+++ b/Telegram/gyp/PrecompiledHeader.cmake
@@ -114,7 +114,7 @@ function(add_precompiled_header _target _input)
       set(_compiler_FLAGS "@${_pch_c_flags_file}")
       add_custom_command(
         OUTPUT "${_output_c}"
-        COMMAND "${CMAKE_C_COMPILER}" ${_compiler_FLAGS} -x c-header -o "${_output_c}" -c "${_pchfile}"
+        COMMAND "${CMAKE_C_COMPILER}" ${_compiler_FLAGS} "$(C_DEFINES)" "$(C_INCLUDES)" "$(C_FLAGS)" -x c-header -o "${_output_c}" -c "${_pchfile}"
         DEPENDS "${_pchfile}" "${_pch_c_flags_file}"
         IMPLICIT_DEPENDS C "${_pch_header}"
         COMMENT "Precompiling ${_name} for ${_target} (C)")
@@ -125,7 +125,7 @@ function(add_precompiled_header _target _input)
       set(_compiler_FLAGS "@${_pch_cpp_flags_file}")
       add_custom_command(
         OUTPUT "${_output_cxx}"
-        COMMAND "${CMAKE_CXX_COMPILER}" ${_compiler_FLAGS} -x c++-header -o "${_output_cxx}" -c "${_pchfile}"
+        COMMAND "${CMAKE_CXX_COMPILER}" ${_compiler_FLAGS} "$(CXX_DEFINES)" "$(CXX_INCLUDES)" "$(CXX_FLAGS)" -x c++-header -o "${_output_cxx}" -c "${_pchfile}"
         DEPENDS "${_pchfile}" "${_pch_cpp_flags_file}"
         IMPLICIT_DEPENDS CXX "${_pch_header}"
         COMMENT "Precompiling header ${_name} for ${_target} (C++)")