diff --git a/install.sh b/install.sh
index a496a2d..6006a24 100755
--- a/install.sh
+++ b/install.sh
@@ -15,63 +15,44 @@ lowercase(){
 }
 
 OS=`lowercase \`uname\``
-KERNEL=`uname -r`
-MACH=`uname -m`
 
-if [ "$OS" == "windowsnt" ]; then
-    OS=windows
-elif [ "$OS" == "darwin" ]; then
-    OS=mac
+if [ -f /etc/os-release ]; then
+    # freedesktop.org and systemd
+    . /etc/os-release
+    OS=`lowercase` $ID_LIKE
+    ID=`lowercase` $ID
+    VER=$VERSION_ID
+elif type lsb_release >/dev/null 2>&1; then
+    # linuxbase.org
+    OS=$(lsb_release -si)
+    VER=$(lsb_release -sr)
+elif [ -f /etc/lsb-release ]; then
+    # For some versions of Debian/Ubuntu without lsb_release command
+    . /etc/lsb-release
+    OS=$DISTRIB_ID
+    VER=$DISTRIB_RELEASE
+elif [ -f /etc/debian_version ]; then
+    # Older Debian/Ubuntu/etc.
+    OS=Debian
+    VER=$(cat /etc/debian_version)
+elif [ -f /etc/SuSe-release ]; then
+    # Older SuSE/etc.
+    ...
+elif [ -f /etc/redhat-release ]; then
+    # Older Red Hat, CentOS, etc.
+    ...
 else
-    OS=`uname`
-    if [ "${OS}" = "SunOS" ] ; then
-        OS=Solaris
-        ARCH=`uname -p`
-        OSSTR="${OS} ${REV}(${ARCH} `uname -v`)"
-    elif [ "${OS}" = "AIX" ] ; then
-        OSSTR="${OS} `oslevel` (`oslevel -r`)"
-    elif [ "${OS}" = "Linux" ] ; then
-        if [ -f /etc/redhat-release ] ; then
-            DistroBasedOn='RedHat'
-            DIST=`cat /etc/redhat-release |sed s/\ release.*//`
-            PSUEDONAME=`cat /etc/redhat-release | sed s/.*\(// | sed s/\)//`
-            REV=`cat /etc/redhat-release | sed s/.*release\ // | sed s/\ .*//`
-        elif [ -f /etc/SuSE-release ] ; then
-            DistroBasedOn='SuSe'
-            PSUEDONAME=`cat /etc/SuSE-release | tr "\n" ' '| sed s/VERSION.*//`
-            REV=`cat /etc/SuSE-release | tr "\n" ' ' | sed s/.*=\ //`
-        elif [ -f /etc/mandrake-release ] ; then
-            DistroBasedOn='Mandrake'
-            PSUEDONAME=`cat /etc/mandrake-release | sed s/.*\(// | sed s/\)//`
-            REV=`cat /etc/mandrake-release | sed s/.*release\ // | sed s/\ .*//`
-        elif [ -f /etc/debian_version ] ; then
-            DistroBasedOn='Debian'
-            DIST=`cat /etc/lsb-release | grep '^DISTRIB_ID' | awk -F=  '{ print $2 }'`
-            PSUEDONAME=`cat /etc/lsb-release | grep '^DISTRIB_CODENAME' | awk -F=  '{ print $2 }'`
-            REV=`cat /etc/lsb-release | grep '^DISTRIB_RELEASE' | awk -F=  '{ print $2 }'`
-        fi
-        if [ -f /etc/UnitedLinux-release ] ; then
-            DIST="${DIST}[`cat /etc/UnitedLinux-release | tr "\n" ' ' | sed s/VERSION.*//`]"
-        fi
-        OS=`lowercase $OS`
-        DistroBasedOn=`lowercase $DistroBasedOn`
-        readonly OS
-        readonly DIST
-        readonly DistroBasedOn
-        readonly PSUEDONAME
-        readonly REV
-        readonly KERNEL
-        readonly MACH
-    fi
-
+    # Fall back to uname, e.g. "Linux <version>", also works for BSD, etc.
+    OS=$(uname -s)
+    VER=$(uname -r)
 fi
 
-read -p 'Soll Nginx mit Lets Encrypt eingerichtet werden? (Y/n)' ifle
+read -p 'Soll Nginx mit Lets Encrypt eingerichtet werden? (y/n)' ifle
 
-if [ "$ifle" == "Y" ] || [ "$ifle" == "y" ] || ["$ifle" == "" ]; then
+if [ "$ifle" == "Y" ] || [ "$ifle" == "y" ]; then
 	git clone https://github.com/certbot/certbot.git /opt/certbot
 
-	if [ "$DIST" == "Fedora" || "$DIST" == "CentOS" ] || [ "$DIST" == "CentOS Linux" ]; then
+	if [ $OS == "fedora" ] || [ $ID == "fedora" ] || [ $OS == "centos" ] || [ $ID == "centos" ]; then
 		ln -s /opt/certbot/certbot-auto /usr/local/sbin/certbot
 		ln -s /opt/certbot/certbot-auto /usr/local/sbin/letsencrypt
 		cp make_cert /usr/local/sbin
@@ -85,13 +66,13 @@ if [ "$ifle" == "Y" ] || [ "$ifle" == "y" ] || ["$ifle" == "" ]; then
 	crontab -l | { cat; echo "@weekly certbot renew --pre-hook 'systemctl stop nginx' --post-hook 'systemctl start nginx' --quiet"; } | crontab -
 fi
 
-if [ "$DIST" == "Fedora" ]; then
+if [ $OS == "fedora" ] || [ $ID == "fedora" ]; then
 	dnf install gcc gcc-c++ autoconf automake make perl -y
-elif [ "$DIST" == "Ubuntu" ] || [ "$DistroBasedOn" == "debian" ]; then
+elif [ $OS == "debian" ] || [ $ID == "ubuntu" ] || [ $ID == "debian" ]; then
 	apt-get install gcc g++ autoconf automake make perl openssl libssl-dev -y
-elif [ "$DIST" == "CentOS" ] || [ "$DIST" == "CentOS Linux" ]; then
+elif [ $OS == "centos" ] || [ $ID == "centos" ]; then
 	yum install gcc gcc-c++ autoconf automake make perl wget -y
-elif [ "$DistroBasedOn" == "suse" ]; then
+elif [ $OS == "suse" ] || [ $ID == "opensuse" ]; then
 	zypper install -y gcc gcc-c++ autoconf automake make perl
 fi
 
@@ -126,7 +107,7 @@ cp nginx.conf /usr/local/nginx/
 mkdir -p /usr/local/nginx/snippets
 cp ssl-params.conf /usr/local/nginx/snippets/
 
-if [ "$DIST" == "Fedora" || "$DIST" == "CentOS" ] || [ "$DIST" == "CentOS Linux" ]; then
+if [ $OS == "fedora" ] || [ $ID == "fedora" ] || [ $OS == "centos" ] || [ $ID == "centos" ]; then
 	cp ngensite /usr/local/sbin
 	chmod +x /usr/local/sbin/ngensite
 else
@@ -148,7 +129,7 @@ cd /usr/local/nginx
 mkdir sites-available
 mkdir sites-enabled
 
-if [ "$DIST" == "Fedora" || "$DIST" == "CentOS" ] || [ "$DIST" == "CentOS Linux" ]; then
+if [ $OS == "fedora" ] || [ $ID == "fedora" ] || [ $OS == "centos" ] || [ $ID == "centos" ]; then
 	ln -s /usr/local/nginx/nginx /usr/local/sbin/nginx
 else
 	ln -s /usr/local/nginx/nginx /usr/local/bin/nginx