diff --git a/README.md b/README.md
index e8928c2..7e544fb 100644
--- a/README.md
+++ b/README.md
@@ -49,10 +49,10 @@ check supported packages. remember to run `update_list` at first.
 
 download. 
 
-__Note__: use `download` for packages in the `list`; use `download_old` for packages in the `old_list`.
+__Note__: use `download` for packages in the `list`; use `download_old` for packages in the `old_list`. If you need to debug a higher version of glibc with symbols,root privileges be required.
 
 ```
-➜  glibc-all-in-one ./download 2.23-0ubuntu10_i386
+➜  glibc-all-in-one ./download 2.23-0ubuntu10_i386 --no-system
 Getting 2.23-0ubuntu10_i386
   -> Location: https://mirror.tuna.tsinghua.edu.cn/ubuntu/pool/main/g/glibc/libc6_2.23-0ubuntu10_i386.deb
   -> Downloading libc binary package
@@ -68,6 +68,28 @@ Getting 2.23-0ubuntu10_i386
 ld-2.23.so  libc-2.23.so   ......
 ```
 
+```
+➜  glibc-all-in-one sudo ./download 2.35-0ubuntu3.1_amd64 --system
+Getting 2.35-0ubuntu3.1_amd64
+  -> Location: https://mirror.tuna.tsinghua.edu.cn/ubuntu/pool/main/g/glibc/libc6_2.35-0ubuntu3.1_amd64.deb
+  -> Downloading libc binary package
+  -> Extracting libc binary package
+x - debian-binary
+x - control.tar.zst
+x - data.tar.zst
+/home/xxx/glibc-all-in-one-master
+  -> Package saved to libs/2.35-0ubuntu3.1_amd64
+  -> Location: https://mirror.tuna.tsinghua.edu.cn/ubuntu/pool/main/g/glibc/libc6-dbg_2.35-0ubuntu3.1_amd64.deb
+  -> Downloading libc debug package
+  -> Extracting libc debug package
+x - debian-binary
+x - control.tar.zst
+x - data.tar.zst
+/home/xxx/glibc-all-in-one-master
+  -> Package saved to libs/2.35-0ubuntu3.1_amd64/.debug and copy the symbol files in .build-id to /usr/lib/debug/
+
+```
+
 ```
 ➜  glibc-all-in-one ./download_old 2.24-3ubuntu2.2_amd64
 ......
@@ -94,4 +116,21 @@ __note__: change the `GLIBC_DIR` in the `build`, if you don't want to build them
 
 ```sh
 ./build 2.29 i686
+```
+
+## Symbolic debugging of higher versions of glibc
+
+If your environment is ubuntu16 or 18, then the default GDB version is lower (GDB < 8.3) and does not support parsing the symbol files in `.build-id.` In this case, you need to upgrade the GDB version.
+
+Version 9.2 is recommended, use the following methods to complete the upgrade
+
+```
+apt install texinfo
+cp `which gdb` `which gdb`-old
+cp `which gdbserver` `which gdbserver`-old
+wegt http://ftp.gnu.org/gnu/gdb/gdb-9.2.tar.gz
+tar -xzvf  gdb-9.2.tar.gz 
+cd gdb-9.2 && mkdir build && cd build
+../configure --with-python=`which python3` --enable-targets=all
+make && make install
 ```
\ No newline at end of file
diff --git a/download b/download
index 18c0cdd..6db508d 100755
--- a/download
+++ b/download
@@ -8,7 +8,8 @@ if [ ! -d "debs" ];  then
     mkdir debs
 fi
 
-SOURCE="https://mirror.tuna.tsinghua.edu.cn/ubuntu/pool/main/g/glibc"
+SOURCE="https://ubuntu.repo.cure.edu.uy/mirror/pool/main/g/glibc/"
+#SOURCE="https://mirror.tuna.tsinghua.edu.cn/ubuntu/pool/main/g/glibc"
 # Use the source below if you feel slow, or change it on your own.
 # SOURCE="http://archive.ubuntu.com/ubuntu/pool/main/g/glibc/"
 
@@ -21,7 +22,8 @@ die() {
 }
 
 usage() {
-  echo >&2 "Usage: $0 id"
+  echo >&2 "Usage: sudo $0 id --system  or  $0 id --no-system"
+  echo >&2 "Describe: If you need to debug a higher version of glibc with symbols, you must bring the \"--system\" parameter and need root privileges."
   exit 2
 }
 
@@ -54,10 +56,14 @@ download_single() {
 
   mkdir libs/$id/.debug
   ./extract debs/$dbg_name libs/$id/.debug
-  echo "  -> Package saved to libs/$id/.debug"
+  if [[ $2 == "--system" ]]; then
+    echo "  -> Package saved to libs/$id/.debug and copy the symbol files in .build-id to /usr/lib/debug/"
+  else
+    echo "  -> Package saved to libs/$id/.debug"
+  fi
 }
 
-if [[ $# != 1 ]]; then
+if [[ $# != 2 ]]; then
   usage
 fi
-download_single "$1"
+download_single "$1" "$2"
\ No newline at end of file
diff --git a/extract b/extract
index 92c3645..a2052b2 100755
--- a/extract
+++ b/extract
@@ -35,6 +35,7 @@ extract() {
       || cp -rP $tmp/usr/lib/debug/.build-id $out 2>/dev/null \
       || die "Failed to save. Check it manually $tmp"
 
+    cp -r  $tmp/usr/lib/debug/.build-id/* /usr/lib/debug/.build-id/ 2>/dev/null
     rm -rf $tmp
 }