remove resolvconf and enable systemd-resolved

scripts/installer.sh

@@ -15,6 +15,8 @@ function log() {
   echo -e "$(date +'%Y-%m-%dT%H:%M:%S')" "==> installer: $1"
 }
 
+export DEBIAN_FRONTEND=noninteractive
+
 apt_ready="no"
 function prepare_apt_once() {
     [[ "${apt_ready}" == "yes" ]] && return
@@ -76,10 +78,17 @@ if [[ "${ubuntu_version}" == "18.04" ]]; then
     exit 2
 fi
 
-# switch over to systemd
-systemctl disable unbound || true
-systemctl stop unbound || true
-systemctl enable --now systemd-resolved
+# switch over to resolved and uninstall resolvconf
+if dpkg -s resolvconf 2>/dev/null >/dev/null; then
+    log "disabling unbound"
+    systemctl disable unbound || true
+    systemctl stop unbound || true
+    log "enabling systemd-resolved"
+    systemctl enable --now systemd-resolved
+    log "removing resolvconf"
+    prepare_apt_once
+    apt -y --purge remove resolvconf # purge required for dpkg -s to return error code
+fi
 
 # https://docs.docker.com/engine/installation/linux/ubuntulinux/
 readonly docker_version="26.0.1"