diff --git a/debian/compat b/debian/compat
deleted file mode 100644
index ec635144f60..00000000000
--- a/debian/compat
+++ /dev/null
@@ -1 +0,0 @@
-9
diff --git a/debian/compat.in b/debian/compat.in
new file mode 100644
index 00000000000..7a1172f248b
--- /dev/null
+++ b/debian/compat.in
@@ -0,0 +1,2 @@
+#buster bionic eoan focal#9
+#sid#10
diff --git a/debian/libqgis-3d{QGIS_ABI}.lintian-overrides b/debian/libqgis-3d{QGIS_ABI}.lintian-overrides
new file mode 100644
index 00000000000..3404235745a
--- /dev/null
+++ b/debian/libqgis-3d{QGIS_ABI}.lintian-overrides
@@ -0,0 +1,2 @@
+spelling-error-in-binary * Pres Press
+spelling-error-in-binary * wHE when
diff --git a/debian/libqgis-analysis{QGIS_ABI}.lintian-overrides b/debian/libqgis-analysis{QGIS_ABI}.lintian-overrides
index 59c6ba81cbc..b44b19d20dc 100644
--- a/debian/libqgis-analysis{QGIS_ABI}.lintian-overrides
+++ b/debian/libqgis-analysis{QGIS_ABI}.lintian-overrides
@@ -1,2 +1,7 @@
 no-symbols-control-file *
 shlib-calls-exit *
+spelling-error-in-binary * Addd Add
+spelling-error-in-binary * PrES Press
+spelling-error-in-binary * Pres Press
+spelling-error-in-binary * liK link
+spelling-error-in-binary * pres press
diff --git a/debian/libqgis-app{QGIS_ABI}.lintian-overrides b/debian/libqgis-app{QGIS_ABI}.lintian-overrides
index 237b71a70c3..fae574cac29 100644
--- a/debian/libqgis-app{QGIS_ABI}.lintian-overrides
+++ b/debian/libqgis-app{QGIS_ABI}.lintian-overrides
@@ -1 +1,7 @@
 no-symbols-control-file *
+spelling-error-in-binary * MoR More
+spelling-error-in-binary * Pres Press
+spelling-error-in-binary * Righ Right
+spelling-error-in-binary * Rigt Right
+spelling-error-in-binary * pres press
+spelling-error-in-binary * whE when
diff --git a/debian/libqgis-core{QGIS_ABI}.lintian-overrides b/debian/libqgis-core{QGIS_ABI}.lintian-overrides
index 9449cfe76d0..ec395f184ea 100644
--- a/debian/libqgis-core{QGIS_ABI}.lintian-overrides
+++ b/debian/libqgis-core{QGIS_ABI}.lintian-overrides
@@ -1,2 +1,13 @@
 shlib-calls-exit *
 no-symbols-control-file *
+spelling-error-in-binary * Buid Build
+spelling-error-in-binary * ObAY Obey
+spelling-error-in-binary * PreS Press
+spelling-error-in-binary * Pres Press
+spelling-error-in-binary * aKs ask
+spelling-error-in-binary * cHEK check
+spelling-error-in-binary * dsFg dfsg
+spelling-error-in-binary * nam name
+spelling-error-in-binary * prEs press
+spelling-error-in-binary * pres press
+spelling-error-in-binary * tAHt that
diff --git a/debian/libqgis-gui{QGIS_ABI}.lintian-overrides b/debian/libqgis-gui{QGIS_ABI}.lintian-overrides
index 9449cfe76d0..12c3751ffe6 100644
--- a/debian/libqgis-gui{QGIS_ABI}.lintian-overrides
+++ b/debian/libqgis-gui{QGIS_ABI}.lintian-overrides
@@ -1,2 +1,10 @@
 shlib-calls-exit *
 no-symbols-control-file *
+spelling-error-in-binary * Lik Link
+spelling-error-in-binary * LsIt List
+spelling-error-in-binary * TEh The
+spelling-error-in-binary * aKs ask
+spelling-error-in-binary * akS ask
+spelling-error-in-binary * hapen happen
+spelling-error-in-binary * oFO of
+spelling-error-in-binary * yElD yield
diff --git a/debian/libqgispython{QGIS_ABI}.lintian-overrides b/debian/libqgispython{QGIS_ABI}.lintian-overrides
index 237b71a70c3..80da46538e2 100644
--- a/debian/libqgispython{QGIS_ABI}.lintian-overrides
+++ b/debian/libqgispython{QGIS_ABI}.lintian-overrides
@@ -1 +1,2 @@
 no-symbols-control-file *
+spelling-error-in-binary * Pres Press
diff --git a/debian/python3-qgis.lintian-overrides b/debian/python3-qgis.lintian-overrides
index a2435037709..8e16348bde3 100644
--- a/debian/python3-qgis.lintian-overrides
+++ b/debian/python3-qgis.lintian-overrides
@@ -1 +1,10 @@
 hardening-no-fortify-functions *
+spelling-error-in-binary * Afe Safe
+spelling-error-in-binary * Buid Build
+spelling-error-in-binary * IiF If
+spelling-error-in-binary * Iif If
+spelling-error-in-binary * Wih With
+spelling-error-in-binary * afe safe
+spelling-error-in-binary * lik link
+spelling-error-in-binary * mor more
+spelling-error-in-binary * onself oneself
diff --git a/debian/qgis-plugin-grass.lintian-overrides b/debian/qgis-plugin-grass.lintian-overrides
index 970046b533b..e793bd32b83 100644
--- a/debian/qgis-plugin-grass.lintian-overrides
+++ b/debian/qgis-plugin-grass.lintian-overrides
@@ -1,2 +1,3 @@
 package-name-doesnt-match-sonames *
 no-symbols-control-file *
+spelling-error-in-binary * naM name
diff --git a/debian/qgis-provider.lintian-overrides b/debian/qgis-provider.lintian-overrides
new file mode 100644
index 00000000000..d25002f93bf
--- /dev/null
+++ b/debian/qgis-provider.lintian-overrides
@@ -0,0 +1,4 @@
+spelling-error-in-binary * Pres Press
+spelling-error-in-binary * nams names
+spelling-error-in-binary * neeS needs
+spelling-error-in-binary * pres press
diff --git a/debian/qgis-providers.lintian-overrides b/debian/qgis-providers.lintian-overrides
new file mode 100644
index 00000000000..7abf487689c
--- /dev/null
+++ b/debian/qgis-providers.lintian-overrides
@@ -0,0 +1,2 @@
+spelling-error-in-binary * pres press
+spelling-error-in-binary * Pres Press
diff --git a/debian/qgis.lintian-overrides b/debian/qgis.lintian-overrides
new file mode 100644
index 00000000000..ebbb8776d7a
--- /dev/null
+++ b/debian/qgis.lintian-overrides
@@ -0,0 +1,3 @@
+spelling-error-in-binary * NAm Name
+spelling-error-in-binary * Ofo Of
+spelling-error-in-binary * yAu you
diff --git a/external/mdal/frmts/mdal_esri_tin.cpp b/external/mdal/frmts/mdal_esri_tin.cpp
index 8471b1155b6..84a0f76082e 100644
--- a/external/mdal/frmts/mdal_esri_tin.cpp
+++ b/external/mdal/frmts/mdal_esri_tin.cpp
@@ -61,7 +61,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverEsriTin::load( const std::string &uri, c
     inMsx.seekg( -4, std::ios::end );
     int32_t mskBegin;
     if ( ! readValue( mskBegin, inMsx, true ) )
-      throw MDAL::Error( MDAL_Status::Err_UnknownFormat, "Unable to find the beggining of data in msk file" );
+      throw MDAL::Error( MDAL_Status::Err_UnknownFormat, "Unable to find the beginning of data in msk file" );
 
     //read information in mskFile
     inMsk.seekg( -mskBegin * 2, std::ios::end );
@@ -80,7 +80,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverEsriTin::load( const std::string &uri, c
       //read mask file
       if ( c % 32 == 0 && c < maskBitsCount ) //first bit in the mask array have to be used-->read next maskInt
         if ( ! readValue( maskInt, inMsk, true ) )
-          throw MDAL::Error( MDAL_Status::Err_UnknownFormat, "Unable to read information in mask file" );
+          throw MDAL::Error( MDAL_Status::Err_UnknownFormat, "Unable to read information in msk file" );
 
       Face f;
       for ( int i = 0; i < 3; ++i )
diff --git a/external/mdal/frmts/mdal_flo2d.cpp b/external/mdal/frmts/mdal_flo2d.cpp
index 76e1861a8d1..8fcdda585e6 100644
--- a/external/mdal/frmts/mdal_flo2d.cpp
+++ b/external/mdal/frmts/mdal_flo2d.cpp
@@ -723,7 +723,7 @@ std::unique_ptr< MDAL::Mesh > MDAL::DriverFlo2D::load( const std::string &result
 
   catch ( MDAL_Status error )
   {
-    MDAL::Log::error( error, name(), "error occured while loading file " + resultsFile );
+    MDAL::Log::error( error, name(), "error occurred while loading file " + resultsFile );
     mMesh.reset();
   }
   catch ( MDAL::Error err )
@@ -898,7 +898,7 @@ bool MDAL::DriverFlo2D::persist( DatasetGroup *group )
   }
   catch ( MDAL_Status error )
   {
-    MDAL::Log::error( error, name(), "error occured" );
+    MDAL::Log::error( error, name(), "error occurred" );
     return true;
   }
   catch ( MDAL::Error err )
diff --git a/external/mdal/frmts/mdal_gdal.cpp b/external/mdal/frmts/mdal_gdal.cpp
index c56dd4a49c1..b992ef61062 100644
--- a/external/mdal/frmts/mdal_gdal.cpp
+++ b/external/mdal/frmts/mdal_gdal.cpp
@@ -612,7 +612,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverGdal::load( const std::string &fileName,
   }
   catch ( MDAL_Status error )
   {
-    MDAL::Log::error( error, name(), "error occured while loading " + fileName );
+    MDAL::Log::error( error, name(), "error occurred while loading " + fileName );
     mMesh.reset();
   }
   catch ( MDAL::Error err )
diff --git a/external/mdal/frmts/mdal_hec2d.cpp b/external/mdal/frmts/mdal_hec2d.cpp
index ee9966b313e..f7b2a439ad3 100644
--- a/external/mdal/frmts/mdal_hec2d.cpp
+++ b/external/mdal/frmts/mdal_hec2d.cpp
@@ -728,7 +728,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverHec2D::load( const std::string &resultsF
   }
   catch ( MDAL_Status error )
   {
-    MDAL::Log::error( error, name(), "Error occured while loading file " + resultsFile );
+    MDAL::Log::error( error, name(), "Error occurred while loading file " + resultsFile );
     mMesh.reset();
   }
   catch ( MDAL::Error err )
diff --git a/external/mdal/frmts/mdal_xdmf.cpp b/external/mdal/frmts/mdal_xdmf.cpp
index a3673d05120..8e94e3220e5 100644
--- a/external/mdal/frmts/mdal_xdmf.cpp
+++ b/external/mdal/frmts/mdal_xdmf.cpp
@@ -652,7 +652,7 @@ void MDAL::DriverXdmf::load( const std::string &datFile,
   }
   catch ( MDAL_Status err )
   {
-    MDAL::Log::error( err, "Error occured while loading file " + mDatFile );
+    MDAL::Log::error( err, "Error occurred while loading file " + mDatFile );
   }
   catch ( MDAL::Error err )
   {
diff --git a/external/mdal/frmts/mdal_xms_tin.cpp b/external/mdal/frmts/mdal_xms_tin.cpp
index ce9bd41fab4..16f17650aa3 100644
--- a/external/mdal/frmts/mdal_xms_tin.cpp
+++ b/external/mdal/frmts/mdal_xms_tin.cpp
@@ -105,7 +105,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverXmsTin::load( const std::string &meshFil
   // Read triangles
   if ( !std::getline( in, line ) )
   {
-    MDAL::Log::error( MDAL_Status::Err_IncompatibleMesh, name(), meshFile + " does not contain valid triangle definition" );
+    MDAL::Log::error( MDAL_Status::Err_IncompatibleMesh, name(), meshFile + " does not contain valid triangle definitions" );
     return nullptr;
   }
   chunks = split( line,  ' ' );
@@ -127,7 +127,7 @@ std::unique_ptr<MDAL::Mesh> MDAL::DriverXmsTin::load( const std::string &meshFil
     if ( chunks.size() != 3 )
     {
       // should have 3 indexes
-      MDAL::Log::error( MDAL_Status::Err_IncompatibleMesh, name(), meshFile + " does not contain valid triangle defintion" );
+      MDAL::Log::error( MDAL_Status::Err_IncompatibleMesh, name(), meshFile + " does not contain valid triangle definitions" );
       return nullptr;
     }
 
diff --git a/external/mdal/mdal.cpp b/external/mdal/mdal.cpp
index 744ebc4fb0f..ff21322dcc0 100644
--- a/external/mdal/mdal.cpp
+++ b/external/mdal/mdal.cpp
@@ -858,7 +858,7 @@ void MDAL_G_closeEditMode( MDAL_DatasetGroupH group )
   bool error = dr->persist( g );
   if ( error )
   {
-    MDAL::Log::error( MDAL_Status::Err_InvalidData, "Persist error occured in driver" );
+    MDAL::Log::error( MDAL_Status::Err_InvalidData, "Persist error occurred in driver" );
   }
 }
 
diff --git a/external/mdal/mdal_datetime.cpp b/external/mdal/mdal_datetime.cpp
index 6e9f0a59d7d..f62841bf31c 100644
--- a/external/mdal/mdal_datetime.cpp
+++ b/external/mdal/mdal_datetime.cpp
@@ -246,16 +246,16 @@ void MDAL::DateTime::setWithGregorianJulianCalendarDate( MDAL::DateTime::DateTim
 
 std::string MDAL::DateTime::toString( MDAL::DateTime::DateTimeValues values ) const
 {
-  int miliseconds = int( ( values.seconds - int( values.seconds ) ) * 1000 + 0.5 );
+  int milliseconds = int( ( values.seconds - int( values.seconds ) ) * 1000 + 0.5 );
   std::string msStr;
-  if ( miliseconds > 0 )
+  if ( milliseconds > 0 )
   {
-    if ( miliseconds < 10 )
-      msStr = prependZero( std::to_string( miliseconds ), 3 );
-    else if ( miliseconds < 100 )
-      msStr = prependZero( std::to_string( miliseconds ), 2 );
-    else if ( miliseconds < 1000 )
-      msStr = std::to_string( miliseconds );
+    if ( milliseconds < 10 )
+      msStr = prependZero( std::to_string( milliseconds ), 3 );
+    else if ( milliseconds < 100 )
+      msStr = prependZero( std::to_string( milliseconds ), 2 );
+    else if ( milliseconds < 1000 )
+      msStr = std::to_string( milliseconds );
 
     msStr = std::string( "," ).append( msStr );
   }
diff --git a/external/o2/src/o0simplecrypt.h b/external/o2/src/o0simplecrypt.h
index 3e3363c59d9..b3faf4b2604 100644
--- a/external/o2/src/o0simplecrypt.h
+++ b/external/o2/src/o0simplecrypt.h
@@ -82,7 +82,7 @@ public:
         ProtectionHash     /*!< A cryptographic hash is used to verify the integrity of the data. This method produces a much stronger, but longer check */
     };
     /**
-      Error describes the type of error that occured.
+      Error describes the type of error that occurred.
       */
     enum Error {
         ErrorNoError,         /*!< No error occurred. */
@@ -175,7 +175,7 @@ public:
       Decrypts a cyphertext string encrypted with this class with the set key back to the
       plain text version.
 
-      If an error occured, such as non-matching keys between encryption and decryption,
+      If an error occurred, such as non-matching keys between encryption and decryption,
       an empty string or a string containing nonsense may be returned.
       */
     QString decryptToString(const QString& cyphertext) ;
@@ -183,7 +183,7 @@ public:
       Decrypts a cyphertext string encrypted with this class with the set key back to the
       plain text version.
 
-      If an error occured, such as non-matching keys between encryption and decryption,
+      If an error occurred, such as non-matching keys between encryption and decryption,
       an empty string or a string containing nonsense may be returned.
       */
     QByteArray decryptToByteArray(const QString& cyphertext) ;
@@ -191,7 +191,7 @@ public:
       Decrypts a cyphertext binary encrypted with this class with the set key back to the
       plain text version.
 
-      If an error occured, such as non-matching keys between encryption and decryption,
+      If an error occurred, such as non-matching keys between encryption and decryption,
       an empty string or a string containing nonsense may be returned.
       */
     QString decryptToString(QByteArray cypher) ;
@@ -199,7 +199,7 @@ public:
       Decrypts a cyphertext binary encrypted with this class with the set key back to the
       plain text version.
 
-      If an error occured, such as non-matching keys between encryption and decryption,
+      If an error occurred, such as non-matching keys between encryption and decryption,
       an empty string or a string containing nonsense may be returned.
       */
     QByteArray decryptToByteArray(QByteArray cypher) ;
diff --git a/scripts/spell_check/spelling.dat b/scripts/spell_check/spelling.dat
index 20443d04cce..8fb13fb8eb2 100644
--- a/scripts/spell_check/spelling.dat
+++ b/scripts/spell_check/spelling.dat
@@ -1838,6 +1838,7 @@ corespond:correspond
 coresponded:corresponded
 corespondence:correspondence
 coresponding:corresponding
+correponsding:corresponding
 coresponds:corresponds
 coridal:cordial
 cornmitted:committed