diff --git a/install/vst-install-debian.sh b/install/vst-install-debian.sh
index 9c93757a..0b001ec3 100755
--- a/install/vst-install-debian.sh
+++ b/install/vst-install-debian.sh
@@ -115,12 +115,13 @@ set_default_lang() {
         ar cz el fa hu ja no pt se ua
         bs da en fi id ka pl ro tr vi
         cn de es fr it nl pt-BR ru tw
-        "
-    if !(echo $lang_list | grep -w $lang 1>&2>/dev/null); then
+        bg ko sr th ur"
+    if !(echo $lang_list |grep -w $lang 1>&2>/dev/null); then
         eval lang=$1
     fi
 }
 
+
 #----------------------------------------------------------#
 #                    Verifications                         #
 #----------------------------------------------------------#
diff --git a/install/vst-install-rhel.sh b/install/vst-install-rhel.sh
index 5440ebec..29bdd36b 100755
--- a/install/vst-install-rhel.sh
+++ b/install/vst-install-rhel.sh
@@ -112,12 +112,13 @@ set_default_lang() {
         ar cz el fa hu ja no pt se ua
         bs da en fi id ka pl ro tr vi
         cn de es fr it nl pt-BR ru tw
-        "
-    if !(echo $lang_list | grep -w $lang 1>&2>/dev/null); then
+        bg ko sr th ur"
+    if !(echo $lang_list |grep -w $lang 1>&2>/dev/null); then
         eval lang=$1
     fi
 }
 
+
 #----------------------------------------------------------#
 #                    Verifications                         #
 #----------------------------------------------------------#
diff --git a/install/vst-install-ubuntu.sh b/install/vst-install-ubuntu.sh
index eb030d1a..4e5409e3 100755
--- a/install/vst-install-ubuntu.sh
+++ b/install/vst-install-ubuntu.sh
@@ -127,12 +127,13 @@ set_default_lang() {
         ar cz el fa hu ja no pt se ua
         bs da en fi id ka pl ro tr vi
         cn de es fr it nl pt-BR ru tw
-        "
-    if !(echo $lang_list | grep -w $lang 1>&2>/dev/null); then
+        bg ko sr th ur"
+    if !(echo $lang_list |grep -w $lang 1>&2>/dev/null); then
         eval lang=$1
     fi
 }
 
+
 #----------------------------------------------------------#
 #                    Verifications                         #
 #----------------------------------------------------------#