diff --git a/tools/debian_buildenv.sh b/tools/debian_buildenv.sh
index 97c43cf6bb5f..b3cff9bc6dd0 100755
--- a/tools/debian_buildenv.sh
+++ b/tools/debian_buildenv.sh
@@ -52,16 +52,34 @@ case "$1" in
         fi
 
         # Install a faster linker. Prefer mold, fall back to lld
-        if apt-cache show mold 2>%1 >/dev/null;
+        if apt-cache show mold 2>/dev/null >/dev/null;
         then
             sudo apt-get install -y --no-install-recommends mold
         else
-            if apt-cache show lld 2>%1 >/dev/null;
+            if apt-cache show lld 2>/dev/null >/dev/null;
             then
                 sudo apt-get install -y --no-install-recommends lld
             fi
         fi
 
+        # Check if fonts-ubuntu is available (from non-free repository)
+        if ! apt-cache show fonts-ubuntu 2>/dev/null | grep -q "Package: fonts-ubuntu"; then
+            echo ""
+            echo "WARNING: The package 'fonts-ubuntu' is not available."
+            echo "This package is required for Mixxx and is located in the Debian non-free repository."
+            echo ""
+            echo "See also: https://wiki.debian.org/SourcesList"
+            echo ""
+            read -p "Would you like to exit to enable 'non-free' now? (y = Exit / n = Continue without fonts): " -n 1 -r
+            echo
+            if [[ $REPLY =~ ^[Yy]$ ]]; then
+                echo "Please edit your /etc/apt/sources.list, run 'sudo apt update', and restart this script."
+                exit 1
+            fi
+        else
+            FONTS_UBUNTU_AVAILABLE=true
+        fi
+
         sudo apt-get install -y --no-install-recommends -- \
             ccache \
             cmake \
@@ -72,7 +90,7 @@ case "$1" in
             docbook-to-man \
             dput \
             fonts-open-sans \
-            fonts-ubuntu \
+            "$([ "$FONTS_UBUNTU_AVAILABLE" = true ] && echo "fonts-ubuntu")" \
             g++ \
             lcov \
             libavformat-dev \