diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 417fada0..55718bc3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -141,7 +141,9 @@ jobs:
             sha256sum pkg.bin && sha256sum pkg.bin | grep -qwF -- "${OLD_CMAKE_SHA256_WIN_INTEL}" && unzip -q pkg.bin && rm -f pkg.bin
             printf '%s' ~/cmake-"${OLD_CMAKE_VERSION}"-win64-x64/bin/cmake.exe > ~/old-cmake-path.txt
           elif [[ "${MATRIX_IMAGE}" = *'ubuntu'* ]]; then
+            sudo find /etc/apt/sources.list.d -type f -not -name 'ubuntu.sources' -delete -print
             sudo sed -i '/azure/d' /etc/apt/apt-mirrors.txt; cat /etc/apt/apt-mirrors.txt
+            sudo apt-get -o Dpkg::Use-Pty=0 update
             sudo apt-get -o Dpkg::Use-Pty=0 install libgcrypt-dev libssl-dev libwolfssl-dev
             /home/linuxbrew/.linuxbrew/bin/brew install mbedtls@3
             cd ~
@@ -346,6 +348,7 @@ jobs:
           [ "${MATRIX_CRYPTO}" = 'OpenSSL' ] && pkgs+=" libssl-dev:${MATRIX_ARCH}"
           [ "${MATRIX_CRYPTO}" = 'wolfSSL' ] && pkgs+=" libwolfssl-dev:${MATRIX_ARCH}"
           if [ -n "${pkgs}" ]; then
+            sudo find /etc/apt/sources.list.d -type f -not -name 'ubuntu.sources' -delete -print
             sudo sed -i '/azure/d' /etc/apt/apt-mirrors.txt; cat /etc/apt/apt-mirrors.txt
             sudo apt-get -o Dpkg::Use-Pty=0 update
             sudo apt-get -o Dpkg::Use-Pty=0 install ${pkgs}
@@ -675,6 +678,7 @@ jobs:
         env:
           INSTALL_PACKAGES: ${{ matrix.compiler == 'clang-tidy' && 'clang-20 clang-tidy-20' || '' }}
         run: |
+          sudo find /etc/apt/sources.list.d -type f -not -name 'ubuntu.sources' -delete -print
           sudo sed -i '/azure/d' /etc/apt/apt-mirrors.txt; cat /etc/apt/apt-mirrors.txt
           sudo apt-get -o Dpkg::Use-Pty=0 update
           sudo apt-get -o Dpkg::Use-Pty=0 install gcc-mingw-w64-x86-64-win32 ${INSTALL_PACKAGES}