bug fix

install.sh

@@ -45,12 +45,12 @@ check_system(){
     elif [[ "${ID}" == "debian" && ${VERSION_ID} -ge 8 ]];then
         echo -e "${OK} ${GreenBG} 当前系统为 Debian ${VERSION_ID} ${VERSION} ${Font}"
         INS="apt"
-        INS update
+        $INS update
         ## 添加 Nginx apt源
     elif [[ "${ID}" == "ubuntu" && `echo "${VERSION_ID}" | cut -d '.' -f1` -ge 16 ]];then
         echo -e "${OK} ${GreenBG} 当前系统为 Ubuntu ${VERSION_ID} ${UBUNTU_CODENAME} ${Font}"
         INS="apt"
-        INS update
+        $INS update
     else
         echo -e "${Error} ${RedBG} 当前系统为 ${ID} ${VERSION_ID} 不在支持的系统列表内，安装中断 ${Font}"
         exit 1