diff --git a/build/tools/before_install.sh b/build/tools/before_install.sh
index f64a9bedd4..e9e445acd2 100755
--- a/build/tools/before_install.sh
+++ b/build/tools/before_install.sh
@@ -28,8 +28,8 @@ case $(uname -s) in
                 return $rc
             }
 
+            codename=$(lsb_release --codename --short)
             if [ "$wxUSE_ASAN" = 1 ]; then
-                codename=$(lsb_release --codename --short)
                 # Enable the `-dbgsym` repositories.
                 echo "deb http://ddebs.ubuntu.com ${codename} main restricted universe multiverse
                 deb http://ddebs.ubuntu.com ${codename}-updates main restricted universe multiverse" | \
@@ -64,6 +64,18 @@ case $(uname -s) in
                             ;;
                     esac
 
+                    case "$codename" in
+                        jammy)
+                            # Under Ubuntu 22.04 installing libgstreamer1.0-dev
+                            # fails because it depends on libunwind-dev which
+                            # is not going to be installed because it conflicts
+                            # with the pre-installed (in GitHub Actions
+                            # environment) libc++-dev, so we need to install it
+                            # directly to avoid errors later.
+                            extra_deps="$extra_deps libunwind-dev"
+                            ;;
+                    esac
+
                     extra_deps="$extra_deps \
                             libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
                             libglu1-mesa-dev"