From d99c2953a6748781dd620fd068235ebc9a82cced Mon Sep 17 00:00:00 2001
From: MickLesk <47820557+MickLesk@users.noreply.github.com>
Date: Tue, 27 Oct 2026 09:24:03 +0100
Subject: [PATCH] Skip the IPv6 sysctl when the host kernel has no IPv6

---
 lxc/install.func | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lxc/install.func b/lxc/install.func
index 7eb9647..35f1d43 100644
--- a/lxc/install.func
+++ b/lxc/install.func
@@ -1114,6 +1114,10 @@ verb_ip6() {
   set_std_mode # Set STD mode based on VERBOSE
 
   if [[ "${IPV6_METHOD:-}" == "disable" ]]; then
+    if [[ ! -d /proc/sys/net/ipv6 ]]; then
+      msg_ok "IPv6 is already disabled by the host kernel"
+      return 0
+    fi
     msg_info "Disabling IPv6 (this may affect some services)"
     mkdir -p /etc/sysctl.d
     cat >/etc/sysctl.d/99-disable-ipv6.conf <<EOF