improved linux system name detection, fix #1035

scripts/requirements

@@ -10,11 +10,26 @@ system="$(uname)"
 
 if [[ "Linux" == "$system" ]] || [[ "$(uname|tr a-z A-Z)" =~ *BSD* ]]
 then
-  for file in /etc/*-release
-  do
-    release="( $(cat $file) )"
-    break
-  done
+  if
+    [[ -f /etc/lsb-release ]] && release="$( grep "^DISTRIB_DESCRIPTION=" /etc/lsb-release )"
+  then
+    release="${release#*=}"
+  elif
+    [[ -f /etc/os-release ]] && release="$( grep "^PRETTY_NAME=" /etc/os-release )"
+  then
+    release="${release#*=}"
+  elif
+    [[ -f /etc/debian_version ]]
+  then
+    release="Debian $(cat /etc/debian_version)"
+  else
+    for file in /etc/*-release
+    do
+      [[ -r $file ]] || continue
+      release="( $(cat $file) )"
+      break
+    done
+  fi
   printf "%b" "
 Requirements for ${system} $release
 "