diff --git a/openmamba-release.spec b/openmamba-release.spec
index 3025e8d..5168a18 100644
--- a/openmamba-release.spec
+++ b/openmamba-release.spec
@@ -18,7 +18,7 @@
 
 Name:          openmamba-release
 Version:       2020.11
-Release:       1mamba
+Release:       2mamba
 Summary:       Release files for %{distroid} %{fullversion} %{?codename:(%codename)}
 Group:         System/Configuration
 Vendor:        openmamba
@@ -35,7 +35,8 @@ Obsoletes:     openmamba-devel
 BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 ## AUTOBUILDREQ-BEGIN
 ## AUTOBUILDREQ-END
-Requires(post):gnupg
+Requires(post):gnupg2
+Requires(post):chkconfig
 #Requires(post):rpm
 
 %description
@@ -116,6 +117,17 @@ if [ $1 -ge 1 ]; then
 fi
 :
 
+%posttrans
+# Clean broken alternatives
+for r in `seq 1 3`; do
+   for l in /etc/alternatives/*; do
+      if [ ! -e "$l" ]; then
+         /usr/sbin/update-alternatives --remove `basename $l` `readlink -m $l` 2>/dev/null
+	  fi
+   done
+done
+:
+
 %files
 %defattr(-,root,root)
 %{_bindir}/%{distroid}-release
@@ -140,6 +152,9 @@ fi
 %config %{_sysconfdir}/yum/repos.d/openmamba-rolling-unstable.repo
 
 %changelog
+* Sun Nov 22 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 2020.11-2mamba
+- added a posttrans script to clean broken alternatives
+
 * Sat Nov 21 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 2020.11-1mamba
 - update to 2020.11