diff --git a/setup.sh b/setup.sh
index a0d0c8f..d3a6081 100755
--- a/setup.sh
+++ b/setup.sh
@@ -260,11 +260,11 @@ if apt-cache show sshuttle &>/dev/null 2>&1; then
     PACKAGES+=(sshuttle)
 fi
 
-# aircrack-ng not available on all Ubuntu arm64 mirrors — add only if present
-if apt-cache show aircrack-ng &>/dev/null 2>&1; then
+# aircrack-ng not available on all Ubuntu arm64 mirrors — add only if a real candidate exists
+if apt-cache policy aircrack-ng 2>/dev/null | grep -q "Candidate: [^(none)]"; then
     PACKAGES+=(aircrack-ng)
 else
-    warn "aircrack-ng not available in apt cache -- skipping (install manually if needed)"
+    warn "aircrack-ng has no install candidate -- skipping (install manually if needed)"
 fi
 
 info "Updating package cache..."