diff --git a/.github/workflows/Build_wheels_for_cpython312_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython312_x86_u16.yml
index 97480dff6..8f7d5cd15 100644
--- a/.github/workflows/Build_wheels_for_cpython312_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython312_x86_u16.yml
@@ -24,7 +24,7 @@ jobs:
             getpipurl: https://bootstrap.pypa.io/pip/get-pip.py
             pypkg: python3.12
             pyengine_tag: cp312-cp312
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/.github/workflows/Build_wheels_for_cpython313_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython313_x86_u16.yml
index f121beff7..d22602c8a 100644
--- a/.github/workflows/Build_wheels_for_cpython313_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython313_x86_u16.yml
@@ -24,7 +24,7 @@ jobs:
             getpipurl: https://bootstrap.pypa.io/pip/get-pip.py
             pypkg: python3.13
             pyengine_tag: cp313-cp313
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/.github/workflows/Build_wheels_for_cpython313t_x64_u16.yml b/.github/workflows/Build_wheels_for_cpython313t_x64_u16.yml
index 4311ccf12..3444cbf99 100644
--- a/.github/workflows/Build_wheels_for_cpython313t_x64_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython313t_x64_u16.yml
@@ -1,4 +1,4 @@
-name: Build wheels for CPython3.13-nogil x64 on Ubuntu22 with GCC-10 All warnings
+name: Build wheels for CPython3.13-nogil x64 on Ubuntu16 with GCC-5 All warnings
 
 on: [push, pull_request]
 
@@ -14,12 +14,12 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - name: Ubuntu 24+22 amd64 CPython 3.13-nogil
+          - name: Ubuntu 24+16 amd64 CPython 3.13-nogil
             runs-on: ubuntu-latest
             matrix: linux
             arch: amd64
             tag_arch: x86_64
-            release: jammy
+            release: xenial
             mirror: http://azure.archive.ubuntu.com/ubuntu
             getpipurl: https://bootstrap.pypa.io/pip/get-pip.py
             pypkg: python3.13-nogil
@@ -63,10 +63,10 @@ jobs:
           sudo mount none ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}}/proc -t proc
           sudo mount none ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}}/dev/pts -t devpts
           sudo mount none ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}}/sys -t sysfs
-          echo "# deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/python ubuntu-${{matrix.os.release}} main" > rusoft-python.list
-          echo "# deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/backports ubuntu-${{matrix.os.release}} main" > rusoft-backports.list
-          echo "# deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/packages ubuntu-${{matrix.os.release}} main" > rusoft-packages.list
-          echo " deb [trusted=yes] http://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu ${{matrix.os.release}} main" > deadsnakes.list
+          echo " deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/python ubuntu-${{matrix.os.release}} main" > rusoft-python.list
+          echo " deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/backports ubuntu-${{matrix.os.release}} main" > rusoft-backports.list
+          echo " deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/packages ubuntu-${{matrix.os.release}} main" > rusoft-packages.list
+          echo "# deb [trusted=yes] http://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu ${{matrix.os.release}} main" > deadsnakes.list
           sudo chroot ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}} /usr/bin/apt update
           sudo cp -v ./*.list ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}}/etc/apt/sources.list.d
           sudo chroot ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}} /bin/bash -c 'cd /etc/apt/trusted.gpg.d && wget http://packages.rusoft.ru/apt/public.gpg -Orusoft.gpg'
diff --git a/.github/workflows/Build_wheels_for_cpython313t_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython313t_x86_u16.yml
index 5f11f4bda..0719d94c4 100644
--- a/.github/workflows/Build_wheels_for_cpython313t_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython313t_x86_u16.yml
@@ -29,7 +29,7 @@ jobs:
             pypkgexe: python3.13t
             #pypkgadd: python3.13-distutils
             pyengine_tag: cp313-cp313t
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -69,7 +69,7 @@ jobs:
           echo " deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/python ubuntu-${{matrix.os.release}} main" > rusoft-python.list
           echo " deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/backports ubuntu-${{matrix.os.release}} main" > rusoft-backports.list
           echo " deb [trusted=yes] http://packages.rusoft.ru/ppa/rusoft/packages ubuntu-${{matrix.os.release}} main" > rusoft-packages.list
-          echo " deb [trusted=yes] http://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu ${{matrix.os.release}} main" > deadsnakes.list
+          echo "# deb [trusted=yes] http://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu ${{matrix.os.release}} main" > deadsnakes.list
           false && sudo find ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}} -iname apt
           sudo chroot ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}} /usr/bin/apt update
           sudo cp -v ./*.list ./ubuntu-${{matrix.os.release}}-${{matrix.os.arch}}/etc/apt/sources.list.d
diff --git a/.github/workflows/Build_wheels_for_cpython314_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython314_x86_u16.yml
index d9974a334..a9add75e7 100644
--- a/.github/workflows/Build_wheels_for_cpython314_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython314_x86_u16.yml
@@ -24,7 +24,7 @@ jobs:
             getpipurl: https://bootstrap.pypa.io/pip/get-pip.py
             pypkg: python3.14
             pyengine_tag: cp314-cp314
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/.github/workflows/Build_wheels_for_cpython314t_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython314t_x86_u16.yml
index 32e6e0f92..cc2c53f12 100644
--- a/.github/workflows/Build_wheels_for_cpython314t_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython314t_x86_u16.yml
@@ -29,7 +29,7 @@ jobs:
             pypkgexe: python3.14t
             #pypkgadd: python3.13-distutils
             pyengine_tag: cp314-cp314t
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/.github/workflows/Build_wheels_for_cpython315_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython315_x86_u16.yml
index 4d96628b2..714def95e 100644
--- a/.github/workflows/Build_wheels_for_cpython315_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython315_x86_u16.yml
@@ -27,7 +27,7 @@ jobs:
             pypkg: python3.15
             #pypkgadd: python3.13-distutils
             pyengine_tag: cp315-cp315
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/.github/workflows/Build_wheels_for_cpython315t_x86_u16.yml b/.github/workflows/Build_wheels_for_cpython315t_x86_u16.yml
index e7e1bca9b..b055275ca 100644
--- a/.github/workflows/Build_wheels_for_cpython315t_x86_u16.yml
+++ b/.github/workflows/Build_wheels_for_cpython315t_x86_u16.yml
@@ -29,7 +29,7 @@ jobs:
             pypkgexe: python3.15t
             #pypkgadd: python3.13-distutils
             pyengine_tag: cp315-cp315t
-            libc_tag: manylinux_2_14
+            libc_tag: manylinux_2_4
     steps:
       - name: Checkout code
         uses: actions/checkout@v4