Support Ubuntu and Debian-derived OS using ID_LIKE in /etc/os-release (…

…#343)

* Support Ubuntu and Debian-derived OS using ID_LIKE in /etc/os-release

* Revert end of case correction.

deb-get

@@ -2407,6 +2407,10 @@ esac
 OS_CODENAME=$(lsb_release --codename --short)
 if [ -e /etc/os-release ]; then
     UPSTREAM_ID="$(grep "^ID=" /etc/os-release | cut -d'=' -f2)"
+    UPSTREAM_ID_LIKE="$(grep "^ID_LIKE=" /etc/os-release | cut -d'=' -f2 | sed s/\"//g | cut -d' ' -f1)"
+    if [ ! -z "$UPSTREAM_ID_LIKE" ]; then
+        UPSTREAM_ID=$UPSTREAM_ID_LIKE
+    fi
     case "${UPSTREAM_ID}" in
         debian) UPSTREAM_CODENAME=$(grep DEBIAN_CODENAME /etc/os-release | cut -d'=' -f2);;
         ubuntu) UPSTREAM_CODENAME=$(grep UBUNTU_CODENAME /etc/os-release | cut -d'=' -f2);;