Update build.func

misc/build.func

@@ -6178,6 +6178,19 @@ create_lxc_container() {
     exit 216
   }
 
+  # Workaround for util-linux >= 2.40.3 agetty bug that leaks CSI 6n cursor
+  # position responses ("R;80R") into the login prompt on the noVNC tty console.
+  # Affects Fedora 43+, Arch (rolling), Rocky/Alma 10+, openSUSE Tumbleweed.
+  # Switching to /dev/console avoids the broken pty path entirely.
+  # See: https://forum.proxmox.com/threads/178350/ (util-linux commit 7b90601f)
+  case "$var_os" in
+  fedora | rocky | almalinux | centos | openeuler | opensuse | archlinux)
+    if ! grep -q '^cmode:' "/etc/pve/lxc/$CTID.conf"; then
+      echo "cmode: console" >>"/etc/pve/lxc/$CTID.conf"
+    fi
+    ;;
+  esac
+
   msg_ok "LXC Container ${BL}$CTID${CL} ${GN}was successfully created."
 }